What is a political party?

The question is basic, but needs to be asked again as daft Sinkies are
still too daft to understand what is a political party. To the daft
Sinkies there is only one right political party and the rest are
bordering on being anti establishment, anti country and anti people, or
simply irresponsible, reckless and fools. A political party is a legal
institution protected under the Constitution.