PHP is a popular server-side scripting language designed primarily for web development. It allows developers to create dynamic web pages that can interact with databases and handle user input. PHP is open-source, meaning it is free to use and has a large community that contributes to its ongoing development and support. One of the key features of PHP is its ability to integrate easily with various databases, such as MySQL and PostgreSQL. This makes it a preferred choice for building content management systems like WordPress and e-commerce platforms. PHP is known for its simplicity and flexibility, making it accessible for both beginners and experienced developers.