Rust: What is ownership in Rust?

Ownership — Rust's memory management model.

Three rules:

• Each value has one owner.
• Only one owner at a time.
• Value dropped when owner goes out of scope.

1fn main() {
2    let s1 = String::from("hello");
3    let s2 = s1;  // s1 is moved to s2
4    // println!("{}", s1);  // Error! s1 is no longer valid
5    println!("{}", s2);  // OK
6}

Key concepts:

• Move semantics.
• No garbage collector.
• Compile-time checks.
• Memory safety.