What is TypeDoc for?

I don't understand what is the main goal? https://github.com/tgreyuk/typedoc-plugin-markdown/tree/master/packages/docusaurus-plugin-typedoc

A Docusaurus v2 plugin to build API documentation with TypeDoc and the Markdown plugin.

Typedoc

Documentation generator for TypeScript projects.

TypeDoc converts comments in TypeScript source code into rendered HTML documentation or a JSON model. It is extensible and supports a variety of configurations. Available as a CLI or Node module.