The Z80/Z80A was a very popular microprocessor, used in a wide range of applications, from gaming consoles like the [[ColecoVision]] or the [[Sega Master System]] to handhelds like the [[Sega GameGear]] or some TI calculators to personal computers like the [[ZX81]], [[ZX Spectrum]], [[MSX]] and [[VG 5000]].
It was even used in the [[Sega MegaDrive]] as the sound CPU and in the [[Commodore C128]] as a secondary processor in order to achieve [[CP/M]] compatibility. Similarly, the Acorn Z80 Second Processor expansion for the [[BBC Micro]] enables [[CP/M]] compatibility. The [[Sega MegaDrive]] was the best-selling device to feature a Zilog Z80, with 40 million units sold. [https://segaretro.org/Sega_Mega_Drive#:~:text=The%20Mega%20Drive%20is%20Sega%27s,and%203%20million%20in%20Brazil. Source]
Although there were definitely other CPUs in use in the 1980s, the vast majority of microcomputers people had at home or at the office used either a [[MOS 6502]] (or one of its variants), a Zilog [[Z80]], an early member of the [[Intel 8086]] family, or a [[Motorola 68000]].