A PHP framework is a collection of pre-built code libraries and tools designed to streamline the development of web applications using the PHP programming language. These frameworks provide a structured way to build applications, making it easier for developers to manage code, implement features, and maintain security. Popular PHP frameworks include Laravel, Symfony, and CodeIgniter. Using a PHP framework can significantly speed up the development process by offering reusable components and a set of best practices. This allows developers to focus on creating unique features rather than writing repetitive code. Additionally, frameworks often come with built-in support for common tasks like database management and user authentication.