Many people see themselves joined by common interests to a social network that extends beyond their immediate families. People organize themselves to promote causes and organize sports and other leisure activities.
Clubs, societies, and charities often rely on the work of unpaid helpers, or volunteers, to achieve their goals. People volunteer because they agree with the goals of the group, and find satisfaction in helping others. Volunteering can also bring people new friendships, or improve their work skills.
Especially in wealthier societies, people have time for interests, such as sports, outside their main economic and family roles. Joining a club or society with others who share the same interests provides a common bond among people. Some groups, called charities, exist to provide support for those in need.