fad

Fads are objects or behaviors that achieve short - lived popularity but fade away. Fads are often seen as sudden, quick - spreading, and short - lived. Fads include diets, clothing, hairstyles, toys, and more. Some popular fads throughout history are toys such as yo - yos, hula hoops, and fad dances such as the Macarena, floss and the twist.
Similar to habits or customs but less durable, fads often result from an activity or behavior being perceived as emotionally popular or exciting within a peer group, or being deemed "cool" as often promoted by social networks. A fad is said to "catch on" when the number of people adopting it begins to increase to the point of being noteworthy. Fads often fade quickly when the perception of novelty is gone.
Overview
The specific nature of the behavior associated with a fad can be of any type including unusual language usage, distinctive clothing, fad diets or frauds such as pyramid schemes. Apart from general novelty, mass marketing, emotional blackmail, peer pressure, or the desire to "be hip" may drive fads. Popular celebrities can also drive fads, for example the highly popularizing effect of Oprah's Book Club.
Though some consider the term trend equivalent to fad, a fad is generally considered a quick and short behavior whereas a trend is one that evolves into a long term or even permanent change.
باب روز به مُد زودگذر و آنچه گفته می شود که در مدت زمانی کوتاه محبوب شده و سپس کمرنگ می شود. مانند یک کتاب، فیلم، برنامه تلویزیونی، ترانه، مکان یا وسیله.
از نمونه هایی از باب روز می توان به هولاهوپ، ترانه های گروه بیتلز، دیسکو، مکعب روبیک و سری کتاب های هری پاتر اشاره کرد که به ترتیب بین سال های ۱۹۵۸ تا ۲۰۰۰ میلادی محبوبیت زیادی در ایالات متحده امریکا پیدا کرده بودند.
مثلاً رقص Floss یک Fad بود
یا Orange justice