What is defer in Go? What will the code with two defer statements output?

In Go, the keyword defer is used to call a function at a later time — it will be executed after the surrounding function completes, but before it returns.

If there are multiple defer statements in a function, they are executed in the reverse order of their declaration (stack order).

Example:

package main

import "fmt"

func main() {
    defer fmt.Println("First defer")
    defer fmt.Println("Second defer")
    fmt.Println("Main code")
}

The output will be:

Main code
Second defer
First defer

That is, the main code runs first, then the deferred calls are executed in reverse order.