A craze is a popular fad or obsession that sweeps through a particular group, culture or society. It can refer to an intense enthusiasm for something, often characterized by excessive behavior and fanaticism. The term can also be used to describe a temporary madness or passionate outburst of activity. Craze is derived from the Old French word "craquer," meaning to break or snap, which suggests that crazes can have a sudden and overwhelming impact on individuals or communities.