//Rat race is a term used for an endless, self-defeating or pointless pursuit. It conjures up the image of the futile efforts of a lab rat trying to escape while running around a maze or in a wheel. In an analogy to the modern city, many rats in a single maze expend a lot of effort running around, but ultimately achieve nothing (meaningful) either collectively or individually.
The rat race is a term often used to describe work, particularly excessive work; in general terms, if one works too much, one is in the rat race. This terminology contains implications that many people see work as a seemingly endless pursuit with little reward or purpose.// -Wikipedia-