Definition: Renderer.php in PHP is a file that represents a web page or HTML template, where various templates are combined with variables to produce a specific output. Detailed definition: A Renderer is a function in PHP that generates and executes an HTML file from a template, passing in all necessary data and creating the resulting markup. Renderer.php starts by importing a file called 'renderer.php' using the "use" statement. This file contains functions that handle different parts of the process. The 'function' statements are executed for each step within the renderer process: - 'import' loads the template (HTML or CSS). - 'execute' is where data from the input is combined with variables defined in the 'renderer.php'. For example, it might insert content into a div, style a div with text. - 'output' creates and returns the final rendered output. Each function is called sequentially, allowing multiple steps of rendering to be performed without any need for a separate file. The 'return' statement inside each function calls itself to produce the next step in the process.