In daily communication, people use different language varieties when contacting each other depending on different social contexts determined by factors such as participants, the setting and the topic. The use of different language varieties bears different functions or social significance. Generally, the more formal the language between participants is, the more distant their relationship; the more informal the language between participants is, the more intimate their relationship. Usually, people in the same region communicate with each other in regional dialects; people from the same social stratum or class communicate with each other in social dialects; people who are well-educated or distant in relationship or who do not share the same language or culture communicate with each other in standard language; and people from the same community or region, who are intimate to each other or who share one language or one culture communicate with each other in vernacular language. In nearly every speech community, there exists a certain vernacular language. Vernacular language is indigenous, native or local, spoken either by a rural or urban speech community, or by a lower social class; it is informal, or casual, or the least standardized; it is contrastively used with standard language; it is uncodified, but when there is a need, it is codified through the use of the dominant language, i.e., usually the standard language; its existence relies heavily on the dominant language; it is usually acquired as a first variety in the home; it is featured by colloquialisms, vulgarisms, substandard forms, and slang. There are hundreds of vernacular languages throughout the world, there. Vernacular languages, often used for a relatively narrow range of informal functions, include ethnic or tribal languages which are usually the first languages learned by people from those ethnic or tribal groups. The most typical example of vernacular language is Black English Vernacular in America. Vernacular language is even used by some writers in their literary works – Mark Twain in his <i>The Adventures of Huckleberry Finn</i> and Dante in his <i>Divine Comedy</i>. Vernacular language may become a standard language if standard language becomes outdated or is abandoned by the public. It is indispensable in daily communication as it is complementary to standard language. It can never be regarded as sub-standard or inadequate, however, as it is an important language variety.