diff --git a/src/main/java/org/cqfn/astranaut/core/base/DiffTree.java b/src/main/java/org/cqfn/astranaut/core/base/DiffTree.java
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+++ b/src/main/java/org/cqfn/astranaut/core/base/DiffTree.java
@@ -0,0 +1,79 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Ivan Kniazkov
+ *
+ * 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 NON-INFRINGEMENT. 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 org.cqfn.astranaut.core.base;
+
+/**
+ * Difference tree represents the difference between two syntax trees.
+ * This tree structure contains both "regular" nodes and actions. An action is
+ *  a special type of node that specifies the operations required to transform
+ *  a subtree from the original syntax tree to the modified one.
+ * Thus, a DifferentialTree encapsulates both the original tree and the modified
+ *  tree, detailing the differences and the changes needed to transition from one
+ *  to the other.
+ *
+ * @since 2.0.0
+ */
+public class DiffTree {
+    /**
+     * Root node of the difference tree.
+     */
+    private final DiffNode root;
+
+    /**
+     * Constructor.
+     * @param root Root node the difference tree
+     */
+    public DiffTree(final DiffNode root) {
+        this.root = root;
+    }
+
+    /**
+     * Returns the root node of the tree.
+     * @return Root node of the tree
+     */
+    public DiffNode getRoot() {
+        return this.root;
+    }
+
+    /**
+     * Returns the syntax tree before the changes were applied.
+     * @return The syntax tree before the changes
+     */
+    public Tree getBefore() {
+        return new Tree(this.root.getBefore());
+    }
+
+    /**
+     * Returns the syntax tree after the changes were applied.
+     * @return The syntax tree after the changes
+     */
+    public Tree getAfter() {
+        return new Tree(this.root.getAfter());
+    }
+
+    @Override
+    public final String toString() {
+        return this.root.toString();
+    }
+}