How do business incubators differ from business accelerators?

People sometimes use the term “business accelerator” as another term for “business incubator” in an attempt to differentiate themselves in the market. During the recent dot-com boom, numerous terms like “accelerator” emerged to describe business incubation programs. In the current market, many of these terms have fallen away, but “accelerator” remains a relatively popular term to describe business incubation programs.