An ideology is a view about what ought to be thought, said and done about politics in terms
of a sole criterion.

There are three major ideologies

Liberalism is the fundamental form of modern
ideology.

Socialism recognizes that we are not mere selves, but selves in a situation, in a society—and that it
is to these selves that a debt is owed.

Conservatism is an emancipation from the unenlightened liberties justified by tradition to an individual liberty, which is legal or political, justified by the secular criterion of the self.