MAMP is a free, open-source software package that allows users to set up a local web server environment on their computers. It stands for Macintosh, Apache, MySQL, and PHP, which are the core components needed to run dynamic websites. MAMP is particularly popular among developers for testing and developing web applications without needing an internet connection. The software is available for both macOS and Windows, making it accessible to a wide range of users. With MAMP, users can easily manage databases using phpMyAdmin and switch between different PHP versions, enhancing flexibility in web development projects.