What is an example of a 'bandwagon'?

Bandwagon is a vehicle used to carry stuff. It is mostly used in villages to carry stuff.

A "bandwagon" is, figuratively speaking, any cause or movement which has become popular very quickly and which many people join because it is popular and there is a social pressure to join. In today's slang, it is some cause which is "trending". The temperance movement was an example of a bandwagon; so was the "save the whales" campaign. Many darker movements also have the characteristics of a bandwagon: the rise of Nazism for example.