This document discusses the definition and components of theory and communication theory. It defines theory as our understanding of how things work based on conceptual systems and sources of knowledge, which allows us to explain and predict phenomena. Communication theory is defined as a social, dynamic theory that revolves around the source, receiver, and context of information transmission between entities, in order to explain, predict, and solve problems. The document also notes that theories are abstractions and partial, and that communication requires meaning created by people interpreting events.