Dialectology - Diglossia

Diglossia

Another problem occurs in the case of diglossia, used to describe a situation in which, in a given society, there are two closely related languages, one of high prestige, which is generally used by the government and in formal texts, and one of low prestige, which is usually the spoken vernacular tongue. An example of this is Sanskrit, which was considered the proper way to speak in northern India, but only accessible by the upper class, and Prakrit which was the common (and informal or vernacular) speech at the time.

Varying degrees of diglossia are still common in many societies around the world.