Rust: What is the difference between take and drain?

1let mut v = vec![1, 2, 3, 4, 5];
2
3// take: [1,2,3], v remains [4,5]
4let taken: Vec<i32> = v.iter().take(3).cloned().collect();
5
6// drain: remove all, v becomes empty
7let drained: Vec<i32> = v.drain(..).collect();
8// v is now empty