PHP is a popular server-side scripting language used for developing dynamic websites and web applications. Known for its simplicity and wide adoption, PHP powers content management systems like WordPress, Drupal, and Joomla. It supports integration with various databases such as MySQL and PostgreSQL, making it ideal for data-driven applications. PHP is widely used for creating e-commerce platforms, blogs, and social networking sites. Its flexibility and active developer community ensure continual improvements and extensive documentation for developers.