PHP is a widely-used, open-source, server-side scripting language designed mainly for web development. Initially, PHP stood for "Personal Home Page", but now it stands for the recursive acronym "PHP: Hypertext Preprocessor". Created by Danish-Canadian programmer Rasmus Lerdorf in 1993 and released in 1995, PHP can be embedded into HTML, simplifying HTML code and allowing developers to create dynamic web pages.
PHP is used to build web applications, e-commerce sites, content management systems (CMS) like WordPress, and Customer Relationship Management (CRM) systems. PHP excels at server-side scripting, command-line scripting, and even desktop application development. It's compatible with major operating systems and web servers like Apache and IIS, offering flexibility in choosing an operating system and web server. PHP supports both procedural and object-oriented programming. The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License.