Welcome to Android Central! It looks like a notification from the Galaxy Store (previously the Samsung Store). It's Samsung's own app store. My guess is that you either have updates available through Galaxy Store, or it's just advertising something to you. Swipe down the notifications and see what those notifications are.
If you're ever not sure about a notification, you can always swipe down the notifications, and long-press the unknown notification. You should get an App Info option, which will let you know which app is responsible.