From Wikipedia,
In politics, right-wing, the political right, or simply The Right, are terms that refer to the segment of the political spectrum often associated with any of several strains of conservatism, the religious right, and areas of classical liberalism, or simply the opposite of left-wing politics. In some contexts, the term right-wing also can include authoritarian nationalism, but that is generally considered part of the far right, which this article does not cover in any great detail.
The term comes originally from the legislative seating arrangement during the French Revolution, when monarchists who supported the Ancien Régime were commonly referred to as rightists because they sat on the right side of successive legislative assemblies.