Beard

A beard is the collection of hair that grows on the chin, upper lip, cheeks or neck of humans and some non-human animals. In humans, usually only pubescent or adult males are able to grow beards. From an evolutionary viewpoint the beard is a part of the broader category of androgenic hair. It is a vestigial trait from a time when humans had hair on their face and entire body like the hair on gorillas. As humans evolved they lost more hair due to the advantage that hair bore parasitic bugs and ticks and a more glabrous body prevented parasitic bugs. The evolutionary loss of hair is pronounced in some populations and now some races such as: indigenous Americans and Chinese who are more neotenous are unable to grow beards whereas Europeans and the Ainu have more facial hair. Women with hirsutism, a hormonal condition of excessive hairiness, may develop a beard.

Throughout the course of history, societal attitudes toward male beards have varied widely depending on factors such as prevailing cultural-religious traditions and the current era's fashion trends. Some religions (such as Islam and Sikhism) have considered a full beard to be absolutely essential for all males able to grow one, and mandate it as part of their official dogma. Other cultures, even while not officially mandating it, view a beard as central to a man's virility, exemplifying such virtues as wisdom, strength, sexual prowess and high social status. However, in cultures where facial hair is uncommon (or currently out of fashion), beards may be associated with poor hygiene or a "savage", uncivilized, or even dangerous demeanor.

https://en.wikipedia.org/wiki/Beard