Imagine that we are not using this expressions. How we can understand each other? Its hard to guess what the person says if he/she did not communicate with you. Simple, communication is very important to us. Communication is the process of sharing information or thoughts with others. Its very hard to understand if we don't use this expressions by communicating with others, we communicate to express our emotions. We communicate to seek information, and most of all Communication makes a major part of our active life and is a social activity.
This is the way of communicating, is it right? Its very easy to understand whats the person is saying even in simple body language, gestures or even facial expression only, in this way we will know what the person is saying.
See? There's a lot of things that we used to communicate, like email, phone and most of all the social communication (facebook, twitter) and etc.. I know that everyone had used it, and we are using it always. This are the things that we used if a person we like to talk is far from us.
