Studies on Communication Accommodation Theory has advanced rapidly in recent years. Communication is an important part of human life and from the beginning of human history, people have always tried to communicate together and to understand the others and make themselves understood. This paper aims to have a brief review on the notion “Communication Accommodation Theory” (CAT), which is an important aspect of different sciences (e.g., Linguistics, sociology, sociolinguistics, and psychology). The concept of Communication Accommodation is used in all people’s social life, for instance, between mother and child, teacher and student, reporter and listener, doctor and patient, and immigrants (newcomers) and citizens, however, this review helps us to have a better understanding through CAT.