(There are two main types of "keyboards": keyboard workstations and arranger keyboards. This overview focuses specifically on keyboard workstations)
"Workstations" were born out of the late 1970s, when synthesizers and sequencers were combined into a single instrument for the first time. While workstations don't necessarily require a keyboard component, most workstations feature one as the main control device. The development of workstations was historically connected to developments in personal computing; advances in microprocessors, software, memory storage, etc. paved the way to more powerful keyboard workstations. Early models like the Korg M1 (used by Vangelis, Madonna, The Cure, and more) paved the way for today's impressive array of keyboard workstations.