The async pipe in angular will subscribe to an Observable or Promise and returns the latest value it has emitted. When a new value is emitted, the async pipe marks the component to be checked for changes. When the component gets destroyed, the async pipe unsubscribes automatically to avoid potential memory leaks.

What does the async pipe do?

Async Pipe is an impure pipe that automatically subscribes to an observable to emit the latest values. It not only subscribes to an observable, but it also subscribes to a promise and calls the then method. When the components get destroyed, it automatically unsubscribes them to reduce memory leaks.

What is async and Await in angular?

According to MDN: When an async function is called, it returns a Promise. When the async function returns a value, the Promise will be resolved with the returned value. When the async function throws an exception or some value, the Promise will be rejected with the thrown value.