In what cases is it necessary to catch and handle panic errors in a program?

Handling panic errors (panic) is necessary in cases where it is important to guarantee the correct termination of the program or recovery after critical errors to avoid crashes.

For example:

• In server applications, to prevent the entire service from crashing due to one error.
• When working with external resources, to properly close files, connections.
• In libraries, to give users the opportunity to handle critical errors.

This is done using recover() inside a deferred function (defer), which catches the panic and allows the program to continue working or terminate correctly.

Example:

func safeFunction() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Panic caught:", r)
        }
    }()

    // Code that may cause panic
    panic("something went wrong")
}