One of the cool things about Android is the way you can replace the stock app launcher with any number of third-party alternatives such as Nova Launcher or Aviate. If you're new to Android yourself, or just looking for a way to give your Andorid box a makeover, launchers can be a lot of fun to experiment with.
But there is one problem with that. It's not always clear how to switch back to the default launcher if you decide you don't like the new one (and elected to make it the new default by selecting "Always" after tapping the Home button).
Fortunately, even if the new launcher lacks a clear exit strategy, you can get the old one back. This tutorial uses Android 4.4, however the process should be very similar on other Android devices, though it could vary in screens and/or nomenclature.
Step 1: Open the Settings app.
Step 2: Click Apps, then swipe over to the All heading.
Step 3: Scroll down until you find the name of your current launcher, then select it.
Step 4: Scroll down to the Clear Defaults button and click on it.
Step 5: Now, when you click the Home button, you should see an option to choose the launcher you want (just as you did after installing the new one). Select the new Launcher (i.e. Android's native one), and then either "Always" or "Just once" if you want to keep your options open.
And that's it! Now that you have this little tip in your pocket, feel free to go nuts with other launchers. If they don't work out, it's no problem to revert back to the original, even if it's just temporarily.