C#: What is the difference between Task.WhenAll and Task.WhenAny?

1// WhenAll — wait all
2Task t1 = Task.Delay(1000);
3Task t2 = Task.Delay(2000);
4await Task.WhenAll(t1, t2);
5// Waits 2 seconds
6
7// WhenAny — wait first
8Task t1 = Task.Delay(2000);
9Task t2 = Task.Delay(1000);
10Task first = await Task.WhenAny(t1, t2);
11// Waits 1 second