Rust: What is the difference between static and const?

static — global, fixed address. const — compile-time constant.

static:

• Fixed memory address.
• Can be mutable (unsafe).
• Has a lifetime.

const:

• Inlined at compile time.
• No address.
• Immutable.

1// const: compile-time
2const MAX_SIZE: usize = 1024;
3
4// static: runtime
5static APP_NAME: &str = "MyApp";
6static mut COUNTER: i32 = 0;  // unsafe

Key: const for compile-time, static for global state.