URLSession
URLSession is an Apple framework for handling HTTP/HTTPS network requests in iOS, macOS, watchOS, and tvOS applications. It provides a comprehensive API for downloading and uploading data, managing tasks, handling authentication, and caching responses. It is the primary networking component in Apple's ecosystem, replacing the older NSURLConnection.
Developers should learn URLSession when building native Apple apps that require network communication, such as fetching data from REST APIs, uploading files, or streaming content. It is essential for iOS/macOS development because it integrates seamlessly with Apple's security, background execution, and system frameworks, offering robust features like task management, delegate-based callbacks, and support for modern protocols.