Facebook groups are online communities within the Facebook platform where users can connect based on shared interests, hobbies, or goals. These groups can be public, private, or secret, allowing members to control who can see and join the group. Users can post updates, share content, and engage in discussions with other members. Members of Facebook groups can also collaborate on projects, ask questions, and offer support. Group administrators manage the community by setting rules, approving new members, and moderating discussions to ensure a positive environment. This feature fosters a sense of belonging and encourages interaction among users.