What Are Communication Devices?

Communication devices are those devices through which a message can be delivered. Usually it is considered that these devices are used just to enhance speech output for example, amplifiers. Communication devices can transmit messages in the form of text, graphics, voice, and symbols. Some examples, of communication devices include telephone, mobile, computers in the case of emails, and fax machines etc. There are various ways through which these devices are worked and they transmit different forms of messages as mentioned above. For example, voice messages are transmitted over mobiles phones and telephones, graphics and text can be transmitted through emails and fax.