What is the difference between Go's defer, panic, and recover functions?

In Go, defer, panic, and recover are three functions that can be used for error handling and control flow in a program.

**defer** is a keyword in Go that is used to schedule a function call to be executed immediately before the function that contains the **defer** statement returns. The deferred function calls are executed in last-in-first-out (LIFO) order, meaning that the most recently deferred function is executed first. The main purpose of using **defer** is to ensure that certain cleanup tasks are executed even if an error occurs during the execution of a function.

**panic** is a built-in function in Go that is used to cause a run-time error that can be recovered by a **recover** function call. When a panic occurs, the program terminates immediately and starts unwinding the stack, executing deferred functions as it goes until it finds a **recover** call that can handle the panic. If there is no **recover** call, the program exits with a non-zero status.

**recover** is a built-in function in Go that is used to recover from a panic. It must be called inside a deferred function to be effective. When a panic occurs, the program starts unwinding the stack and executing deferred functions until it finds a **recover** call. If the **recover** function is called in the deferred function, the program continues execution as if nothing happened, and the value passed to the **panic** function is returned by **recover**.

In summary, **defer** is used for scheduling cleanup tasks, **panic** is used for generating run-time errors, and **recover** is used for recovering from a panic and resuming normal execution.