How do you use the `?` operator (try operator) to propagate errors in Rust?

The `?` operator is a syntactic sugar that simplifies error propagation. When used within a `Result` context, it automatically returns the error value from the function if the function returns a `Result`. If the function returns `Ok(value)`, the `?` operator unwraps the `value` and returns it. If the function returns `Err(error)`, the `?` operator immediately returns `Err(error)` from the current function.