Ok, here we go.
The Steam website (
http://http://store.steampowered.com/) is a mainly a big online shop to buy video games (and other software as well, but let's focus on the video games for now).
The Steam application is a basically a program that you install on your computer. That program will manage all of the games that you bought on Steam website. You need to create an account (just like a forum, or an online shop, for example) in order to use it.
Once Steam is installed on your computer, and you logged in with your user ID, Steam will show you the list of games that you bought, no matter if they are currently installed or not. Steam remembers everything you bought, no matter what computer you are using. It's like the Google Store, if you have an android phone, for example.
From the program, you see the list of games that you own. For each game, you can:
- install the game: that triggers the download of the files from the Steam website, and the installation itself. It's like a payware plane you bought from JustFlight or FlightSimStore. They know you bought it, and you can download it anytime. With Steam, it's just the same: Steam know you own that game, and with just a click or two, Steam will start to download it and after the download, it will install it on your computer, and it will also activate it if I'm not mistaken. After this, the game is ready to launch. Since my internet connection is quite slow, usually when I buy a new game, I just trigger the installation in the morning just before leaving for work. Steam acts as a download manager, so it goes smooth. When I come back home in the evening, the game is ready to launch
- uninstall the game: that will delete all of the game files from your computer. So if you don't use a game anymore, and you want to free up some space on your hardrive, you can unisntall it with just one click (well, two in fact), from Steam. Of course, the game will still be in your list of owned games, so you can reinstall it anytime.
- launch your game: you select the game, you click on launch, and the game starts. No magic.
- update the game: all games distributed via Steam get automatic updates. You don't need to download patches, this is all done in the background.
- download content/addon/mods: for some games, Steam offers the "Steam Workshop", which is a kind of centralized mod site. The cool thing is when you want to install a mod, you just click on it, and Steam will install it into your game automatically. I used that for Skyrim, for example
So that was about "using" Steam.
Now, for the online shop, it's also quite easy. There are two options which are almost identical:
- browse the online Steam shop from the Steam application
- browse the online Steam shop from a normal navigator (like Firefox or Chrome).
I STRONGLY recommend the second option, much easier, much faster, much everything.
When you go in the Steam online shop using a navigator, you should register first. (if you go via the Steam application, you are already identified, no need to login again).
You can search for games or you can just browse by categories or other selection criteria.
When you want to buy a game, you just click on it and then it's just like any online store: you press buy, you enter the information about your credit card, you validate and that's all, the game is yours and it appears in your game list in the Steam application.
Let me know if you need any additional details.