Group communication deals with groups, organizational communication addresses organizations, mass communication encompasses messages broadcast, usually electronically, to mass audiences, intercultural communication looks at communication among people of different cultures, and gender communication focuses on communication issues of women and between the sexes. Newer contexts include health communication and computer-mediated communication. Contexts of communication are best thought of as a way to focus on certain communication processes and effects. Communication context boundaries are fluid. Thus, we can see interpersonal and group communication in organizations.
Gender communication occurs whenever people of different sexes communicate.
We can have mass communications to individuals, group, and organizations. Some people facetiously say intrapersonal communication exists when someone talks to themselves. It's more accurate to define intrapersonal communication as thinking. While thinking normally falls within the purview of psychology we can recognize that we often think, plan, contemplate, and strategize about communication past, present, and future. It is legitimate to study the cognitive aspects of communication processes.