Final answer:
Webkit, Gecko, and Trident are examples of rendering engines, which are components of web browsers that format web content for display.
Step-by-step explanation:
Webkit, Gecko, and Trident are all examples of rendering engines. These are the software components that web browsers use to interpret HTML and CSS to display web pages on your screen. A rendering engine, also known as a layout engine or browser engine, takes the markup and styling information and formats the content for visual presentation.
Each of these engines powers various web browsers. For example, Webkit was originally used by Safari and was the basis for Blink, the engine used by Chrome. Gecko is the engine behind Firefox, and Trident was used by Internet Explorer. Knowing the kind of rendering engine can be important for web developers, as each engine may have slight differences in interpreting the code, which can affect how websites look and function across different browsers.