how Task works in swift concurrency

In Swift concurrency, the fundamental unit is a Task, which represents an independent concurrent execution context. Tasks are lightweight, allowing you to create many of them. You can wait for a task to complete to get its result or cancel it if its work becomes unnecessary. Tasks can execute concurrently, making them suitable for handling operations like HTTP requests.

When a task runs, it may perform asynchronous operations, such as reading from the disk or messaging another service. While a task is waiting for an asynchronous operation to complete, it suspends to yield the CPU to other tasks. Swift models task suspension in code using the async and await syntax. A function that may suspend is marked with the async keyword, and the await keyword is used to indicate that a suspension can occur on that line.

For more details, you can refer to the session A Swift Tour: Explore Swift’s features and design (18:33).