Description: An Abstract Syntax Tree (AST) is a tree representation of the abstract syntactic structure of source code. The AST is used to represent the hierarchy and relationships of code elements such as classes, methods, variables, and expressions across various programming languages. Each node of the tree corresponds to a language construct, allowing for easier and more efficient interpretation of the code. Unlike a concrete syntax tree, which includes details of the language syntax, the AST focuses on the logical structure of the program, eliminating redundant information. This makes it an essential tool for various applications in programming, such as compilation, static code analysis, and refactoring. The ability to manipulate the AST allows developers to perform transformations on the code more easily and effectively, facilitating tasks such as optimization and code generation. In summary, the Abstract Syntax Tree is fundamental for understanding and working with source code in a more structured and efficient manner.