You must buy them or use a hack to get them illegaly. I will not provide a link.
Yes, some. Not all of them can be activated on Steam. See the related links for a list of the games that can be activated on Steam and for the instructions on how to activate a game on Steam.
All of the games that you have paid for with your account will still be on your steam name even if you delete steam or reinstall your computer. Install the steam again and log in with username/email + password and all your games will be in your library again you just have to redownload them all over again.
All steam games update themselves automatically.
When you have purchased games they will be moved to the 'library' section of your steam. Here you can manage your downloads and see all purchased games.
No. Steam games run on PC/mac and not on Sony PS4 (or nintendo or xbox) at all.
Download Steam and turn it on, you should now see the Steam store, at the top of the Steam app/thing there is in big letters "LIBRARY" hover over that and click "All Games" you should now see the games you own/have purchased.
not at all of u delete/uninstall steam it will still be there but if u delete ur account then it will be deleted but it is ok to deleate steam it will be there
There are free games on there too. A section is devoted to it in the shop tab.
Most of them are sold on Steam by Valve Software.
Yes you can, you import and add non-steam games to your Steam library. From within the library you can launch and run any games, although 'Steam achievements' will only be available for Steam enabled games.
They don't. Only games distributed and managed by Steam can make use of the Steam API.
Yes, you can import and add non-steam games to your Steam library. From within the library you can launch and run any games, although 'Steam achievements' will only be available for Steam enabled games.