diff --git a/core/pom.xml b/core/pom.xml
index 068f980c..98191e62 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -119,6 +119,7 @@
                     <include>**/tests/draft2020-12/additionalProperties.json</include>
                     <include>**/tests/draft2020-12/boolean_schema.json</include>
                     <include>**/tests/draft2020-12/const.json</include>
+                    <include>**/tests/draft2020-12/contains.json</include>
                     <include>**/tests/draft2020-12/dependentRequired.json</include>
                     <include>**/tests/draft2020-12/enum.json</include>
                     <include>**/tests/draft2020-12/exclusiveMaximum.json</include>
diff --git a/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ApplicatorVocabulary.java b/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ApplicatorVocabulary.java
index 1690b2af..0c5b7e6c 100644
--- a/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ApplicatorVocabulary.java
+++ b/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ApplicatorVocabulary.java
@@ -50,7 +50,8 @@ public ApplicatorVocabulary() {
             new SubSchemaKeywordType(AdditionalPropertiesKeyword.NAME, AdditionalPropertiesKeyword::new),
             new NamedJsonSchemaKeywordType(PatternPropertiesKeyword.NAME, PatternPropertiesKeyword::new),
             new SubSchemaKeywordType(ItemsKeyword.NAME, ItemsKeyword::new),
-            new ArraySubSchemaKeywordType(PrefixItemsKeyword.NAME, PrefixItemsKeyword::new)
+            new ArraySubSchemaKeywordType(PrefixItemsKeyword.NAME, PrefixItemsKeyword::new),
+            new SubSchemaKeywordType(ContainsKeyword.NAME, ContainsKeyword::new)
         );
     }
 
diff --git a/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeyword.java b/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeyword.java
new file mode 100644
index 00000000..dcb14df0
--- /dev/null
+++ b/core/src/main/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeyword.java
@@ -0,0 +1,105 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2024 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.github.sebastiantoepfer.jsonschema.core.vocab.applicator;
+
+import static jakarta.json.stream.JsonCollectors.toJsonArray;
+
+import io.github.sebastiantoepfer.ddd.common.Media;
+import io.github.sebastiantoepfer.jsonschema.InstanceType;
+import io.github.sebastiantoepfer.jsonschema.JsonSubSchema;
+import io.github.sebastiantoepfer.jsonschema.keyword.Annotation;
+import io.github.sebastiantoepfer.jsonschema.keyword.Applicator;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonValue;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * <b>contains</b> : <i>Schema</i>
+ * Validation succeeds if the instance contains an element that validates against this schema.<br/>
+ * <br/>
+ * <ul>
+ * <li>applicator</li>
+ * <li>annotation</li>
+ * </ul>
+ *
+ * source: https://www.learnjsonschema.com/2020-12/applicator/contains/
+ * spec: https://json-schema.org/draft/2020-12/json-schema-core.html#section-10.3.1.3
+ */
+final class ContainsKeyword implements Applicator, Annotation {
+
+    static final String NAME = "contains";
+    private final JsonSubSchema contains;
+
+    public ContainsKeyword(final JsonSubSchema contains) {
+        this.contains = Objects.requireNonNull(contains);
+    }
+
+    @Override
+    public Collection<KeywordCategory> categories() {
+        return List.of(KeywordCategory.APPLICATOR, KeywordCategory.ANNOTATION);
+    }
+
+    @Override
+    public boolean hasName(final String name) {
+        return Objects.equals(NAME, name);
+    }
+
+    @Override
+    public <T extends Media<T>> T printOn(final T media) {
+        return media.withValue(NAME, contains);
+    }
+
+    @Override
+    public boolean applyTo(final JsonValue instance) {
+        return !InstanceType.ARRAY.isInstance(instance) || contains(instance.asJsonArray());
+    }
+
+    private boolean contains(final JsonArray array) {
+        return array.stream().anyMatch(contains.validator()::isValid);
+    }
+
+    @Override
+    public JsonValue valueFor(final JsonValue value) {
+        final JsonValue result;
+        if (InstanceType.ARRAY.isInstance(value)) {
+            result = valueFor(value.asJsonArray());
+        } else {
+            result = JsonValue.FALSE;
+        }
+        return result;
+    }
+
+    private JsonValue valueFor(final JsonArray values) {
+        final JsonValue result;
+        final JsonArray matchingItems = values.stream().filter(contains.validator()::isValid).collect(toJsonArray());
+        if (matchingItems.size() == values.size()) {
+            result = JsonValue.TRUE;
+        } else {
+            result = matchingItems;
+        }
+        return result;
+    }
+}
diff --git a/core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeywordTest.java b/core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeywordTest.java
new file mode 100644
index 00000000..f307b6c8
--- /dev/null
+++ b/core/src/test/java/io/github/sebastiantoepfer/jsonschema/core/vocab/applicator/ContainsKeywordTest.java
@@ -0,0 +1,196 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2024 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.github.sebastiantoepfer.jsonschema.core.vocab.applicator;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsInAnyOrder;
+import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.hasEntry;
+import static org.hamcrest.Matchers.is;
+
+import io.github.sebastiantoepfer.ddd.media.core.HashMapMedia;
+import io.github.sebastiantoepfer.jsonschema.core.DefaultJsonSchemaFactory;
+import io.github.sebastiantoepfer.jsonschema.core.keyword.type.SubSchemaKeywordType;
+import io.github.sebastiantoepfer.jsonschema.keyword.Keyword;
+import jakarta.json.Json;
+import jakarta.json.JsonObject;
+import jakarta.json.JsonValue;
+import org.hamcrest.Matcher;
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.Test;
+
+class ContainsKeywordTest {
+
+    @Test
+    void should_be_printable() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            ).printOn(new HashMapMedia()),
+            (Matcher) hasEntry(is("contains"), hasEntry(is("type"), is("number")))
+        );
+    }
+
+    @Test
+    void should_know_his_name() {
+        final Keyword enumKeyword = createKeywordFrom(
+            Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+        );
+
+        assertThat(enumKeyword.hasName("contains"), is(true));
+        assertThat(enumKeyword.hasName("test"), is(false));
+    }
+
+    @Test
+    void should_be_an_applicator_and_annotation() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            ).categories(),
+            Matchers.containsInAnyOrder(Keyword.KeywordCategory.ANNOTATION, Keyword.KeywordCategory.APPLICATOR)
+        );
+    }
+
+    @Test
+    void should_apply_for_non_array() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asApplicator()
+                .applyTo(JsonValue.EMPTY_JSON_OBJECT),
+            is(true)
+        );
+    }
+
+    @Test
+    void should_apply_if_one_item_applies() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asApplicator()
+                .applyTo(
+                    Json.createArrayBuilder()
+                        .add("foo")
+                        .add(3)
+                        .add(false)
+                        .add(Json.createArrayBuilder().add("bar"))
+                        .add(-5)
+                        .build()
+                ),
+            is(true)
+        );
+    }
+
+    @Test
+    void should_apply_if_all_item_applies() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "string")).build()
+            )
+                .asApplicator()
+                .applyTo(Json.createArrayBuilder().add("foo").add("bar").add("baz").build()),
+            is(true)
+        );
+    }
+
+    @Test
+    void should_not_apply_if_non_item_applies() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asApplicator()
+                .applyTo(
+                    Json.createArrayBuilder().add("foo").add(false).add(Json.createArrayBuilder().add("bar")).build()
+                ),
+            is(false)
+        );
+    }
+
+    @Test
+    void should_return_false_for_non_array() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asAnnotation()
+                .valueFor(JsonValue.EMPTY_JSON_OBJECT),
+            is(JsonValue.FALSE)
+        );
+    }
+
+    @Test
+    void should_return_empty_array_if_no_item_applies() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asAnnotation()
+                .valueFor(Json.createArrayBuilder().add("foo").build())
+                .asJsonArray(),
+            is(empty())
+        );
+    }
+
+    @Test
+    void should_return_matching_items() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "number")).build()
+            )
+                .asAnnotation()
+                .valueFor(
+                    Json.createArrayBuilder()
+                        .add("foo")
+                        .add(3)
+                        .add(false)
+                        .add(Json.createArrayBuilder().add("bar"))
+                        .add(-5)
+                        .build()
+                )
+                .asJsonArray(),
+            containsInAnyOrder(Json.createValue(3), Json.createValue(-5))
+        );
+    }
+
+    @Test
+    void should_return_true_if_all_item_applies() {
+        assertThat(
+            createKeywordFrom(
+                Json.createObjectBuilder().add("contains", Json.createObjectBuilder().add("type", "string")).build()
+            )
+                .asAnnotation()
+                .valueFor(Json.createArrayBuilder().add("foo").add("bar").add("baz").build()),
+            is(JsonValue.TRUE)
+        );
+    }
+
+    private static Keyword createKeywordFrom(final JsonObject json) {
+        return new SubSchemaKeywordType("contains", ContainsKeyword::new).createKeyword(
+            new DefaultJsonSchemaFactory().create(json)
+        );
+    }
+}