'PHP (Hypertext Preprocessor)' is a widely-used open-source server-side scripting language that is especially suited for web development. Embedded into HTML, PHP code is executed on the server, generating HTML which is then sent to the client. This process enables dynamic content generation, making PHP a versatile choice for creating interactive web pages.

Originally created by Rasmus Lerdorf in 1994, PHP's ease of use and effectiveness for web development quickly garnered a large following. It allows developers to create session management, work with databases, and even build entire e-commerce platforms. PHP is known for its compatibility with various database management systems, its simplicity, and its vast ecosystem of frameworks and libraries.

PHP's scripting nature means that it can automate server tasks, generate dynamic page content, and manage user sessions. It is integral to popular content management systems like WordPress, Joomla, and Drupal, which power a significant portion of the web. The language's ability to integrate with different services and protocols makes it a preferred choice for backend development.

Over the years, PHP has evolved with improvements in performance, enhanced security features, and a more modern object-oriented programming approach. The language's development is active, with a community that continuously works on updates and security enhancements, ensuring PHP remains relevant in the ever-evolving web landscape.

In conclusion, PHP is a crucial tool in the arsenal of web developers. Its role in server-side scripting, combined with a large community and extensive documentation, makes it an accessible and powerful language for building robust web applications.