This note deals with the basics of Group Dynamics. It discusses the nature and types of groups in organization and elaborates on the need to study group behavior as well as why individuals join groups. The note also discusses the underlying processes in Group Behavior. Here the Interdependence between the group and the individual is discussed. The note also focuses on the distinction between what happens in a group (the content) and the way it happens (the process). It describes various stages of group development and discusses issues relating group structure and cohesiveness. The final section focuses on analysis of Group Interaction and the advantage and disadvantages of groups in organizational setting.