Theodore M. Newcomb's communication model, established in 1953, depicts communication as a triangular process involving a sender (A), a receiver (B), and a subject matter (X) that influences their interaction. It emphasizes the importance of effective communication in maintaining equilibrium in social relationships and highlights the need for individuals to navigate their social environment. While the model has advantages in focusing on messages and social equilibrium, it also has limitations related to message manipulation and lacks discussion on communication barriers.