ANTLR, or another tool for language recognition, is a parser generator for reading, processing, executing, or translating structured text or binary files. The tool is used to create a lexer and a parser from a formal grammar description (EBNF-like notation) that can process character input streams to handle syntax recognition and tree construction. ANTLR has existed since 1989 and has gone through several iterations in response to the changing needs of developers working on compiler-writing tools. It supports the automatic construction of parse trees and abstract syntax trees (AST) through tree grammars. ANTLR is written in Java but can generate parsers in several other programming languages, including C#, Python, JavaScript, and Go. Its ability to target multiple languages greatly expands its utility across different ecosystems while providing development teams with a clear path toward implementing domain-specific languages within their applications.