Alamofire is a popular HTTP networking library for Swift, designed to simplify API interactions in iOS and macOS applications. It provides robust features such as request routing, parameter encoding, and response validation. Alamofire integrates seamlessly with Codable, making it easy to handle JSON responses. It also supports features like background data uploads, session management, and file downloads. The library is highly extensible, enabling developers to build scalable and maintainable network layers.