Google Play is the one-stop shop for digital contents for Android-based devices, as well as Google's official shop for its own Android devices.
While it is certainly possible to download and install apps and other contents from other sources, it is likely that most Android users use Google Play to download apps to their devices, considering that Google Play comes preinstalled on most devices.
Whenever you install an app on Google Play, you are asked to select the device you want to install it on. If you went through several devices in the past, you may notice that all of those devices are listed here, even those that you do not use anymore.
But even if you use multiple devices, you may notice that it is sometimes not as easy to distinguish between devices as it should be, especially if you are using the same device multiple times.
The Google Play My Device settings provide you with a solution. You can access the settings directly by following this link, or open the Google Play homepage and click on the menu button at the top right to find the option listed there.
Here you find a list of all of your devices. The first option that you have is to change a device's visibility. If you do not use it anymore, or want it disabled for the time being, uncheck the show in menus option to hide it from installation menus.
The edit button on the other hand provides you with options to add a nickname for devices. Google uses the maker and model by default, which you can change to any other name you want, e.g. "My Son's Phone", "Work Phone", or "Moto G".
But that is not all that you can do here. Below the device listing you find email preferences, which appear to be enabled by default.
The first "Keep me up to date with news and offers from Google Play" gives Google the permission to send you marketing emails.
The second "I wish to receive email notifications when developers reply to my reviews of their applications" sends out emails whenever developers reply to your application reviews.
You can disable both options easily here, and unless you are particularly interested in Google Play news, I suggest you uncheck the first option at the very least.
Please note that you cannot remove devices entirely from your account, as there is no option available currently to delete a device that you no longer own.