The PlayStation is a video games console produced by Sony in the 1990s; it was launched in Japan in December 1994 and in the USA in September 1995. It is important in the history of video games in being the first popular console to have the power to do 3d graphics using its 33MHz custom CPU. It was hugely popular and spawned a "PlayStation Generation".
Very well known for the Tomb Raider series of games that first came out on the PlayStation.
Sony now make a compatible console in a smaller (and curvier) case called the PSOne.
Sony's succesor to the PlayStation is the hugely more powerful PlayStation 2 and is largely compatible in the sense that it can play most PlayStation games unmodified.
Also known as PSX. A user programmable version called the Net Yaroze was also produced.