A fad is something that is temporarily popular, but its popularity usually declines quickly. Fads often come and go, and they are often replaced by other fads.
2. Lack of lasting significance
Fads are often not very significant, and they do not have a lasting impact on society. They are often just temporary distractions, and they are quickly forgotten.
3. Rapid spread
Fads often spread quickly through a population, and they can be very contagious. People often adopt fads because they want to fit in, or because they want to be seen as trendy.