Angular is a popular open-source front-end web application platform developed by Google. It allows developers to build dynamic, responsive, and interactive web applications using HTML, CSS, and TypeScript. Angular uses a component-based architecture to create reusable UI components that can be easily added to different pages of an application. These components are written in TypeScript, a superset of JavaScript that adds static typing and object-oriented features to the language. Angular also provides powerful tools for data binding, routing, and dependency injection, making it easy to manage complex applications with many moving parts. Overall, Angular is a robust and comprehensive platform for building modern web applications, and it's used by developers all over the world to create everything from simple websites to enterprise-grade applications.