XAMPP is a free and open-source software package that provides a simple way to set up a local web server environment. It includes essential components like Apache, MySQL, PHP, and Perl, allowing developers to create and test web applications on their own computers without needing an internet connection. Designed for ease of use, XAMPP is available for multiple operating systems, including Windows, Linux, and macOS. Its user-friendly interface makes it accessible for beginners, while its powerful features cater to more experienced developers, making it a popular choice for web development projects.