On buffered channels, all read operations will not block if the buffer is not empty and the write operation if the buffer is not full

channel.go

// This code will return a deadlock error.

// Since the channel c is unbuffered, the write operation c<-42 (writing 42 to the channel) will block.
package main

func main() {
	c := make(chan int)
	c <- 42
	val := <-c
	println(val)
}

// A buffered channel will store the integers without waiting for a read operation

package main

func main() {
	c := make(chan int, 1)
	c <- 42
	val := <-c
	println(val)
}

// Without a buffered channel but running the write operation on another thread

package main

func main() {
	c := make(chan int)
	go func() {
		c <- 42
	}()
	val := <-c
	println(val)
}