Rust: What is the difference between MaybeUninit and Option?

MaybeUninit — uninitialized memory. Option — initialized or None.

MaybeUninit:

• Uninitialized.
• Unsafe.
• For initialization.

Option:

• Initialized or None.
• Safe.
• For optional values.

1use std::mem::MaybeUninit;
2
3let mut x = MaybeUninit::<i32>::uninit();
4unsafe {
5    x.as_mut_ptr().write(42);
6    let value = x.assume_init();
7}
8
9let x: Option<i32> = Some(42);
10let y: Option<i32> = None;

Key: MaybeUninit for unsafe initialization, Option for safe optionality.