The JavaScript Ecosystem refers to the collection of tools, libraries, frameworks, and communities that support the development of applications using the JavaScript programming language. Key components include Node.js for server-side programming, React and Angular for building user interfaces, and npm (Node Package Manager) for managing libraries and dependencies. This ecosystem is constantly evolving, with new technologies and best practices emerging regularly. Developers can leverage various resources, such as GitHub for version control and collaboration, and Stack Overflow for community support, making it easier to create robust and efficient applications.