NSURLSession for API Calls

Mobile apps often need to talk to the internet to fetch or send data. This is called networking.

Think of checking the weather, loading your social media feed, or sending a message. All these involve your app making requests to a server.

Servers expose APIs (Application Programming Interfaces), which are sets of rules for how your app can interact with them. Many modern APIs follow the REST architectural style.

In Objective-C, the primary way to perform network requests is using NSURLSession. It's a powerful and flexible API for downloading content over HTTP/HTTPS.

• It replaced older methods like NSURLConnection.
• It handles data tasks, download tasks, and upload tasks.
• It supports background transfers and authentication.

NSURLSession makes network communication more efficient and easier to manage.