How do we exert power by speaking differently?

By adapting our speak, including our words and language,is a way of power and strenght that we use on the people whith whom we are talking. When we speak,we do not always speak to the same people,we speak to people who are differents from us. We do or do not have the same knowlegde, general culture, the same humor and the same way of thinking. Then by speaking we must be able to make them understand what we mean.We speak to make others understand what we want to say because we already knew it so we have to choice some words which are at the level of the people whith whom we are talking to make them understand. This is a power and a strenght because the audience will be influenced by theperson who talk.