Fashion refers to styles of dress (but can also include cuisine, literature, art, architecture, and general comportment) that are popular in a culture at any given time. Such styles may change quickly, and "fashion" in the more colloquial sense refers to the latest version of these styles. Inherent in the term is the idea that the mode will change more quickly than the culture as a whole.

The terms "fashionable" and "unfashionable" are employed to describe whether someone or something fits in with the current or even not so current, popular mode of expression. The term "fashion" is frequently used in a positive sense, as a synonym for glamour, beauty and style. In this sense, fashions are a sort of communal art, through which a culture examines its notions of beauty and goodness. The term "fashion" is also sometimes used in a negative sense, as a synonym for fads and trends, and materialism. A number of cities are recognised as global fashion centres and are recognised for their fashion weeks, where designers exhibit their new clothing collections to audiences. These cities are New York City, Milan, Paris, and London. Other cities, mainly Los Angeles, Tokyo, São Paulo, Sydney, and Dubai also hold fashion weeks and are better recognised every year.