Meteor is an open-source JavaScript web framework designed for rapid application development. Built on Node.js, it enables developers to create real-time web and mobile applications with ease. Meteor uses a unified development environment, allowing the same codebase to run seamlessly on the server and client. Its reactive data system ensures automatic updates to the user interface when the database changes. The framework integrates well with popular front-end libraries like React, Angular, and Vue, and supports native mobile development with Cordova. Known for its simplicity, scalability, and robust ecosystem, Meteor is a go-to choice for building modern, interactive applications.