JSZip is a JavaScript library that offers a straightforward API for creating, reading, and editing .zip files directly in web browsers and server-side applications. With a focus on ease of use, JSZip supports both Node.js and major browsers, including Internet Explorer 6 and up. It allows developers to generate zip files on the client-side, offering functionalities like compressing files, appending content, and manipulating existing zip archives dynamically. JSZip is particularly useful for web applications that need to handle file operations locally without relying on server-side processing. The library is open-source and maintained on GitHub, where users can access the code, report issues, or contribute to its development.