NestJS is a progressive framework for building efficient and scalable server-side applications using Node.js. It leverages modern JavaScript features and is built with TypeScript, which enhances code quality and maintainability. NestJS is designed to work well with various libraries and tools, making it a versatile choice for developers. The framework follows the modular architecture pattern, allowing developers to organize their code into reusable modules. This structure promotes better organization and separation of concerns, making it easier to manage large applications. Additionally, NestJS supports various transport layers, including HTTP and WebSockets, enabling real-time communication in applications.