Explain ownership in Rust and how it prevents memory leaks.

Ownership in Rust: • Each value has a single owner • When owner goes out of scope, value is dropped • Prevents double-free and use-after-free errors • No garbage collector needed • Move semantics by default Example: fn main() { let s1 = String::from("hello"); let s2 = s1; // s1 moved to s2 // println!("{}", s1); // Error: s1 no longer valid println!("{}", s2); // OK }