Channels serve as pipes for communication between concurrent goroutines. They allow one goroutine to send values and another goroutine to receive those values. By default, sending and receiving operations block until both the sender and receiver are ready. This feature enabled us to wait for the "unbuffered channel" message at the end of our program without needing any additional synchronization mechanisms. Buffered channels can hold a limited number of values without requiring an immediate receiver.
Channels can be used to synchronize execution between goroutines. Here is an example of using a channel to wait for a goroutine to complete.