An election campaign is the organized effort by candidates to win voter support during the period leading up to an election. Campaigns involve communicating with voters through various means: door-knocking (canvassing), distributing literature, placing lawn signs, advertising, social media, debates, and community events. Campaigns require volunteers, organization, and typically money for expenses. Campaign finance rules limit spending and require disclosure of contributions. Effective campaigns connect candidates with voters, communicate policy positions, and build the organization needed to identify supporters and ensure they vote. The campaign period officially begins when the election is called and ends on election day.