Background

Background is an empty context that doesn't get cancelled, hasn't got a deadline, and doesn't hold any values. It is mostly used by the main function as the root context or for testing purposes. The following is some example code for this context:

func main() {
    ctx := context.Background()
    done := ctx.Done()
    for i :=0; ;i++{
        select {
        case <-done:
            return
        case <-time.After(time.Second):
            fmt.Println("tick", i)
        }
    }
}

The full example is available here: https://play.golang.org/p/y_3ip7sdPnx.

We can see that, in the context of the example, the loop goes on infinitely because the context is never completed.