Rust: What is the difference between Mutex<T> and RwLock<T>?

1use std::sync::{Mutex, RwLock};
2
3// Mutex
4let data = Mutex::new(vec![]);
5let mut v = data.lock().unwrap();
6v.push(1);
7
8// RwLock
9let data = RwLock::new(vec![]);
10let r = data.read().unwrap();  // Multiple readers
11drop(r);
12let mut w = data.write().unwrap();  // Exclusive write
13w.push(1);