Explanation:

A 'Written Communication' means the sending of messages, orders or instructions in writing through letters, circulars, manuals, reports, telegrams, office memos, bulletins, etc. It is a formal method of communication and is less flexible.

Oral communication is the process of verbally transmitting information and ideas from one individual or group to another. Oral communication can be either formal or informal. Examples of informal oral communication include: Face-to-face conversations.