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The term "fashion" means clothing generally, and the study of it. Fashions trends vary considerably within a society according to age, man or woman, social class, generation, occupation and geography.
There is another term runway or also catwalk describes a narrow, usually elevated platform that runs into an auditorium, used by very good looking models to demonstrate clothing and modern new accessories during a fashion show.
A fashion week is a modern industry event, lasting one week, which allows fashion designers, brands or houses to show and display their latest collections in runway shows and buyers to take a look at the latest trends. The most importantly is that it lets the industry know what's "in" and what's "out" for the seasons - fall fashion (autumn), winter, spring and summer.
The most prominent fashion weeks are in the fashion capitals of the world: New York, London, Milan and Paris. Each city host a special week twice a year, because there are two major trends seasons per year - Autumn/ Winter and Spring/ Summer season.