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NSURLSession is the API for HTTP connections introduced in iOS 7 and OS X 10.9.

The class NSURLSession was introduced to Apple's Foundation.framework in iOS 7 and OS X 10.9.

A NSURLSession object can be considered a group of related data transfer tasks. A response may be received and can be handled via a block statement or delegate methods. NSURLSession provides status and progress properties, of which support canceling, resuming, or suspending tasks, and resuming suspended, canceled, or failed downloads.

Types of Sessions

NSURLSession can support three different types of sessions, which is determined by the configuration object used to initialize the session object.

Default Sessions
Ephemeral Sessions
Background Sessions

Types of Tasks

There are three types of tasks, the last two (Download & Upload) of which support background use.

Data Tasks - Send and receive data via a NSData object
Download Tasks - Retrieves data in the form of a file
Upload Tasks - Sends data, most typically in the form of a file

Related tags to explore: nsurl nsurlsessiontask

Adapted from Apple's URL Loading System Programming Guide > NSURLSession.