Membership of a society is typically voluntary. This means that individuals choose to join a society of their own free will, usually because they share a common interest or goal with the other members.
In some cases, membership may be required by law or regulation, such as in the case of professional organizations or trade unions. However, even in these cases, individuals are usually free to choose whether or not to pursue the profession or trade that requires membership.
Once a person becomes a member of a society, they are usually expected to adhere to the society's rules and regulations, as outlined in its constitution or bylaws. These rules may cover a wide range of activities, from how meetings are conducted to how finances are managed.
Overall, membership in a society is a voluntary and often fulfilling way for individuals to connect with others who share their interests and work together towards common goals.