Crowdsourcing is a method of outsourcing tasks to a large, undefined network of people in an open call format. The document discusses the main types of crowdsourcing which include crowd funding, crowd labor, crowd innovation, distributed knowledge, and crowd creativity. It also provides examples of how crowdsourcing has been used for funding, innovation, labor, aesthetics and branding. The document encourages readers to utilize crowdsourcing and consider how it could benefit their projects and fill gaps in their team's skills.