Synchronous communication happens when one participant says/sends something and then waits for the other participant to reply doing nothing else. Exactly the sa

Synchronous communication happens when one participant says/sends something and then waits for the other participant to reply doing nothing else. Exactly the same as with synchronous function call: you order some operation and wait patiently for it to return the result. Asynchronous communication is when one participant sends something and leaves things as that. For a reply, either another (asynchronous) message is sent, this time in the opposite order, or the sender checks if the reply arrived. Real-time communication, like phone calls, video conferences, and various chats and communicators are synchronous by the very nature of the activity of conversation. Everything that you may postpone checking is asynchronous; e-mail, tickets/issues, and source code commits are like that.