Crowdsourcing is the process of organizing many people to participate in small ways in a joint project to accomplish more than an individual or organization could alone. The document discusses crowdsourcing through the perspectives of collective intelligence, crowd creation, voting and feedback. It also addresses best practices like making tasks bite-sized, including the right crowd, keeping people motivated, and using expert input alongside the crowd. However, it cautions that crowds are unpredictable, can get angry, and most crowd contributions will be useless as crowds have life cycles.