Engine

The term engine can have several meanings depending on the context. It may refer to:

JavaScript engine

JavaScript engines are interpreters that parse and execute JavaScript code. Modern JavaScript engines use just-in-time (JIT) compilation to convert JavaScript code into machine code that can be executed by a computer's processor. A JavaScript engine is typically developed and used in web browser to run client-side code but can also be used in server-side environments like Node.js.

Rendering engine

Rendering engines (also known as layout engines or browser engines) are part of a Browser that transforms HTML, CSS, and other resources of a web page into a visual representation on a screen.