I hear about this alot. Can you give me a break down on why people are going nuts for steam? Sounds like you can buy one and play on different systems...that cool, I guess...but I dont get the hype. Then again, I'm just some guy with limited comp knowledge so
That's only partially true. A game bought for Windows has a license for Mac, if the game is carried on Mac. But you can't play it on XBox or PS4. Since few people would have a Mac and Windows for gaming, it isn't a huge deal to cross license the OS.
Steam has made PC games viable. The PC game market nearly died because of piracy. Publishers pushed all sorts of nasty DRM that pissed off users. Steam secured the IP of the game publishers without punishing the gamer, so now the PC is the biggest platform for major games, typically outselling XBox One and PS4 combined.
Android remains the #1 platform for games, followed closely by IOS.
However, if you take out the CandyCrush type of games played on those platforms, PC is the biggest seller, and Steam is the engine behind it. I can play my Steam games on any computer I own. I can log in at a friends house and play them there. If a drive crashes, my games are protected. Steam has changed gaming for the better.