A political organisation is any organisation whose primary purpose is involving itself in the political process, including political parties, non-governmental organisations, and special interest advocacy groups. Political organisations are those engaged in political activities (e.g., lobbying, community organizing, campaign advertising, etc.) aimed at achieving clearly defined political goals, which typically benefit the interests of their members.
While parties are one type of political organisation that may engage in some or all of those activities, they are distinct in that they typically focus on supporting candidates for public office, winning elections and controlling government.