A Political campaign is an organized effort which seeks to influence the decision making process within a specific group.
Political Campaigns: Crash Course Government and Politics #39 by CrashCourse
In democracies, political campaigns often refer to electoral campaigns, by which representatives are chosen or referendums are decided.
A referendum is a direct vote in which an entire electorate is asked to vote on a particular proposal.
Do political ads on TV actually work? by Vox
In modern politics, the most high-profile political campaigns are focused on general elections and candidates for head of state or head of government, often a president or prime minister.
Head of government is a generic term used for either the highest or second highest official in the executive branch of a sovereign state, a federated state, or a self-governing colony who often presides over a cabinet.
A head of state or Chief of State is the highest-ranking position in a sovereign state and is vested with powers to act as the chief public representative of that state.
A prime minister is the most senior minister of cabinet in the executive branch of government, often in a parliamentary or semi-presidential system.