There are three types of communication: oral, written and nonverbal. Debending on type of communication we yse different communication channels.
Oral Communication. In oral communication we use spoken words. It includes face-to-face conversations, speeches, telephonic conversations, videos, radio, television, voice over internet. In oral communication the message is influenced by tone of voice, volume, speed and clarity of speaking.

• Advantages of oral communication: it is time saving and brings quick feedback; In a face-to-face conversation, by reading facial expression and body language one can guess whether he/she should trust what’s being said or not; It is also costs saving as you need no paper or computer etc.
• Disadvantages of oral communication: fear of distortion of message; no permanent records; unsuitable for lengthy communication, emotional barriers; spontaneous responses.

Written Communication. In written communication, written signs or symbols are used to communicate. A written message may be printed or handwritten. In written communication, a message can be transmitted via email, letter, report, memo, etc. In written communication, the message is influenced by the vocabulary and grammar used, writing style, precision and clarity of the language used.

• Advantages of written communication: messages can be edited and revised many times before it is actually sent; Written communication provides record for every message sent (and received) and can be saved for later study; A written message is recorded permanently so there is less possibility of distortion and alteration of the information.
• Disadvantages of written communication: message doesn’t bring instant feedback; it takes more time, it is costly.

Nonverbal Communication - Nonverbal communication is the sending or receiving of wordless messages, such as gesture, body language, posture, tone of voice or facial expressions. Nonverbal communication is all about the body language of the speaker and it helps the receiver in interpreting the message. Nonverbal communication has the following elements:

• Appearance
• Speaker: clothing, hairstyle, neatness, use of cosmetics
• Surrounding: room size, lighting, decorations, furnishings
• Body Language
• Facial expressions, gestures, postures
• Sounds
• Voice Tone, Volume, Speech rate

!NB! Remember that approximately 65% of your presentation is non-verbal content and only 35% are verbal content.