A sequence of instructions, defined by a block, which is executed sequentially and managed by the scheduler. A task can be in one of the following states: `initialized`, `running`, `completed`, `failed`, `cancelled` or `stopped`.

```mermaid
stateDiagram-v2
[*] --> Initialized
Initialized --> Running : Run

Running --> Completed : Return Value
Running --> Failed : Exception

Completed --> [*]
Failed --> [*]

Running --> Stopped : Stop
Stopped --> [*]
Completed --> Stopped : Stop
Failed --> Stopped : Stop
Initialized --> Stopped : Stop
```

## Example

```ruby
require 'async'

# Create an asynchronous task that sleeps for 1 second:
Async do |task|
	sleep(1)
end
```