Rust: What is the difference between String and &str?

1// String: owned
2let s: String = String::from("hello");
3
4// &str: borrowed
5let s: &str = "hello";  // literal
6let s: &str = &owned_string;  // slice

1// &str -> String
2let owned = String::from("hello");
3
4// String -> &str
5let slice: &str = &owned;