Angular is a platform and framework for building single-page client applications using HTML and TypeScript. It is developed and maintained by Google, offering a powerful set of tools for building dynamic, complex web applications with a component-based architecture.

AngularJS (also known as Angular 1) is the original version, released in 2010, based on JavaScript. Angular (versions 2 and beyond) is a complete rewrite of AngularJS, based on TypeScript, offering better performance, mobile support, and a more modern architecture

Components are the building blocks of an Angular application. Each component consists of a template, a TypeScript class, and styling. Components define a view and handle data for that view.