In the same way that you have to use versions of programs made for IMac to install on an IMac, and versions of programs made for Windows for Windows pcs, you have to use versions of programs (Apps) made for Android operating system.
Most come with a basic set of Apps in same way that Windows OS (XP, W7 etc) come with Wordpad, and picture viewing etc. etc. and you can download some pretty neat free Apps to do most of everything.
There's 'Google play' Store to get your Apps. Here's business apps and to see more categories, click on the down arrow next to 'Business'