Rust: What is the difference between std::time and tokio::time?

1use std::time::{Duration, Instant};
2
3let start = Instant::now();
4std::thread::sleep(Duration::from_secs(1));
5println!("{:?}", start.elapsed());
6
7use tokio::time::{sleep, Duration, Instant};
8
9let start = Instant::now();
10sleep(Duration::from_secs(1)).await;
11println!("{:?}", start.elapsed());