Discuss the advantages and disadvantages of written communication

What will be an ideal response?

Written communications include memos, letters, fax transmissions, e-mail, instant messaging, organizational periodicals, notices placed on bulletin boards (including electronic ones), and any other device that transmits via written words or symbols. It's often tangible and verifiable. When it's printed, both the sender and receiver have a record of the communication; and the message can be stored for an indefinite period. If there are questions about its content, the message is physically available for later reference. This feature is particularly important for complex and lengthy communications. A final benefit of all written communication comes from the process itself. People are usually forced to think more thoroughly about what they want to convey in a written message than in a spoken one.
A drawback of written communication is that it is time consuming. The other major disadvantage is lack of a built-in feedback mechanism. Oral communication allows the receiver to respond rapidly to what he thinks he hears. But mailing a memo provides no assurance it has been received or that the recipient will interpret it as the sender intended.