Context is package in the standard library, used for:

• Canceling goroutines
• controlling timeouts (e. g. for API calling)
• passing metadata

ctx := context.Background() // basically an empty struct 

ctxWithTimeout, cancel := context.WithTimeout(ctx, 2*time.Second) // timing out after 2 sec 

defer cancel() 

We can then have this as deadline in the code, waiting for ctxWithTimeout.Done()