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.