The theory was known as Speech Accommodation Theory until it included non-verbal aspects of communication then it became popular as ' Communication Accommodation' Theory. The theory talks about, people wanting to portray their positive identity to others.
They tend to match their own vocabulary, accent and cadence as of other interactants.
Theory Communication accommodation theory elaborates the human tendency to adjust their behaviour while interacting.
The reason behind this behaviour is explained as to control the social differences between the interactants.
People accommodate their communication activities to get approval and to set a positive image in front of the interactant.
The environment in which they are interacting also affects the communication behaviour.
Whether you realize it or not, and it can be either conscious or unconscious, you match your accent, your speed, your rhythm, your vocabulary and even your stance and gestures to that of the person you are talking to.
The main reason a person does this is to show agreement and affinity for another.
First introduced in 1971, Communication Accommodation Theory, which was known as Speech Accommodation Theory at the time, says that when humans talk to each other, they tend to change the way they talk to match the way the listener talks.
For example, people adopt the slang their friends use to fit in.
People talk differently using different words and gestures accordingly to the different group of people like old people, children, women, men, teens, rich, poor, powerful, weak, etc.
The communication accommodation theory has broadened this theory to include not only speech but also the "non-verbal and discursive dimensions of social interaction".
Like speech accommodation theory, communication accommodation theory continues to draw from social psychology, particularly from four main socio-psychology theories: similarity-attraction, social exchange, causal attribution and intergroup distinctiveness.