What is the async pipe doing in this example?

@Component({
  selector: 'app-users',
  template: '<div *ngFor="let user of users | async">{{ user.name }}</div>',
})
export class UsersComponent implements OnInit {
  users;
  constructor(private httpClient: HttpClient) {}
  ngOnInit(): void {
    this.users = this.httpClient.get<{ name: string }>('users');
  }
}