Steam is actually a gaming Platform like Windows Xbox, I think the company originally was formed as a in home wireless Entertainment system. Designed to control stereo, TV, Movies etc. Something similar to lutron or control 4 home entertainment systems. This where you have a main Mod you can program to control all your systems throughout the home pre programmed. As well lighting , fireplaces garage door openers were all added to these systems. Steam then unfolded its Gaming systems as well. Now it has PC and other device compatibility through its online free Platform gaming platform. There are hundreds of different games you can purchase. It also has a very large online forum of its own. Real gamers use this app. You no the guys that live computer programing and such. There is a lot of gaming advice and resources in many different Forum topiics. Vdeo streaming, Screen shots, as well it has a full chat through Mic, Video or written text as a cool feature. You can form groups aor sqquads and fully haave a conversation with your buudies whhile playing. And as Comet mentioned , Zup was really trying to push steam as it is so much more stable then Windows. The Windows App is basically a corrupted app that has been not working properly since it was released. Windows wont fix it so I also have tried tto get pilots to switch over . The only advantage it has is that it works properly.
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I encourage you to download it . Give it a shot