Communication has been defined as a process. The term process refers to identifiable flow of information through interrelated stages of analysis directed towards the achievement of an objective.
The person who intends to make contract with the objective of passing information, ideas to other persons is known as sender.
This is the subject matter of communication. This might be opinion, attitude, feelings, views, suggestions, orders etc.
Since the subject matter of communication is abstract and intangible, its transmission requires the use of certain symbols such as words, actions, pictures, etc. Conversion of the subject matter in to these symbols is the process of encoding.
These symbols are transmitted through certain channels, e.g. radio, telephone, air, etc., depending upon the situation of the two parties, viz., sender and receiver.
Receiver is the person to whom message is meant for.
Receiver converts the symbols received from the sender to give him the meaning of the message.
Feedback is necessary to ensure that the receiver has received the message and understands it in the same sense as sender wants.