The left-right political spectrum is used to create a model that shows a spectrum of political positions. Traditionally there is a 2-axis spectrum of left and right, but there are also many widely adopted 4-axis model.
The political terms left and right are comparative terms that describe political views as: liberalism, collectivism, and liberty (left) vs. conservatism, individualism, and authority (right).
Since political ideology is a complex spectrum of beliefs and actions, the terms are best applied with nuance. They can be used to make absolute statements like Monarchies are right-wing forms of government in terms of power structure. Or they can be used to make comparative statements such as, a progressive Democrat is to the right of a radical anarchist. See the pages below for detailed discussions into the aspects of the political left and right.