Groups are organised systems of two or more individuals, characterised by mutual interdependence, roles, status, and expectations. The nature of our group membership significantly influences our lives, making it important to be part of groups that influence us positively and help us become good citizens.

Groups influence individual behaviour in two primary ways based on the presence and involvement of others. The first is social facilitation, which occurs when an individual performs an activity alone but in the presence of others. The second is social loafing, which happens when an individual performs an activity along with others as part of a larger group.

Furthermore, while group work generally leads to beneficial results, certain group dynamics can also influence behaviour. In highly cohesive and homogeneous groups, the phenomenon of groupthink may occur, affecting decision-making. Another influence is group polarisation, which alters group opinions.

Ultimately, groups provide security, status, self-esteem, and help in achieving goals. Not only do groups influence us, but we as individuals are also capable of changing others and society through our group interactions.