In the politics of representative democracies, a political machine is a party organization that recruits its members by the use of tangible incentives and that is characterized by a high degree of leadership control over member activity. The machine's power is based on the ability of the boss or group to get out the vote for their candidates on election day.

In politics, a boss is a person who controls a faction or local branch of a political party. They do not necessarily hold public office themselves; most historical bosses did not, at least during the times of their greatest influence. Numerous officeholders in that unit are subordinate to the single boss in party affairs. Bosses may base their power on the support of numerous voters, usually organized voting blocs, and manage a coalition of these blocs and various other stakeholders. When the party wins, they typically control appointments in their unit, and have a voice at the higher levels.