Documentation is the process of providing comprehensive instructions and explanations about a particular piece of software or programming language. It is designed to help developers understand how to use a given technology, as well as provide them with detailed information about its features, functions, and capabilities. In the case of JavaScript, documentation can include tutorials, code examples, API references, and other resources that help developers learn how to use the language to create web applications. Documentation is an essential part of any development process, as it provides developers with the information they need to use the technology effectively and efficiently.