Parties at Survival Rocks
Parties are essentially a collection of candidates. When a party receives enough votes, it can provide those candidates to function as legislator in Parliament.
In Parliament, legislators submit motions, debate those motions with others and vote on motions. If a motion gets passed by majority of legislators, it will (often) be implemented in the server. Motions can be seen as suggestions, but can also advocate for small changes. Go to the Motion page to see what parties have submit and have been voting in Parliament.
Elections take place every 2 months. More information about elections can be found on the Elections Wiki page. You can also create a party by doing '/party create' in-game.