Group dynamics is the study of groups, and also a general term for group processes. Relevant to the fields of psychology, sociology and communication studies a group is two or more individuals who are connected to each other by social relationships.
Because they interact and influence each other, groups develop a number of dynamic processes that separate them from a random collection of individuals. These processes include norms, roles, relations, development, need to belong, social influence, and effects on behavior. The field of group dynamics is primarily concerned with small group behavior.
Everybody is aware that from the moment we born, as long as we grow, we become members of different groups, being constantly influenced by them, in every context.
The "sense" of involvement in a certain group appears to be a specific characteristic in our society (work, university, religion, sports, family, etc).