What Is the Difference Between panic! and Result?

Use panic! to crash the program immediately for unrecoverable errors and Result to return an error value that the caller can handle. panic! aborts execution and prints a stack trace, while Result allows the program to continue by forcing the caller to explicitly handle success or failure cases.

// Unrecoverable: crashes immediately
panic!("Critical failure: cannot proceed");

// Recoverable: returns an error to be handled
let file = std::fs::File::open("hello.txt")
    .expect("Failed to open file"); // or use match/if let

Think of panic! as pulling the emergency brake on a train; the program stops immediately because something is critically wrong. Result is like a traffic light that tells the driver there is an issue ahead, allowing them to decide whether to stop, turn around, or try a different route. You use panic! for bugs you cannot fix at runtime and Result for expected problems like missing files or network timeouts.