Community refers to groups of users who work collaboratively around a shared interest or purpose. People participate in communities to learn, find purposeful work, connect with others who share their interests, and gain a sense of belonging. Examples of community platforms include Meetup for finding local groups, Smule for sharing music, Eduki for teachers, Google Crowdsource for AI training data, and Bikeable for improving cycling infrastructure. Building community involves fostering positive relationships, reflecting together, encouraging strengths, developing a shared vision, taking citizen-led action, and limiting excessive executive compensation.