The bank of icons at the bottom of the Home screen is called the app dock. It provides quick access to your recently used and favorite apps. When rearranging apps, you can drop them onto the app dock to create easy shortcuts.
Whatever you’re doing on your iPad, you can access the app dock with a quick swipe up from the bottom of the screen. Continuing to swipe will not only reveal the dock, but the App Switcher as well.
In addition to the usual apps you have selected for the dock positioned to the left, you’ll find that Apple automatically recommends three more apps to the right. These may be comprised of recently used apps, or even the ones you accessed last on your iPhone or Mac.