A group of people who contest elections to form and run the Government. There can be divergent views on what is good for the society. So, we have many political parties. They try to convince the people, why their policies are better than others.
Parties contest elections
There are two ways in which a party candidate is chosen. The first way, as in India, is that the party high command decides who should get the ticket. The second way, as in the USA, the party workers vote to elect the party candidate.