Google wants to be sure Google Maps are accurate and detailed. Upkeep on Google Maps would otherwise be a nightmare, so Google’s letting you help. If you see a location that is off (like your own house or a store) you can fix it. After all, you know where you live better than anyone else.
As of today you can log into Google Maps and move the markers so they are in the right place. Unless the business owner or resident has already verified the location. Before you get the bright idea to move your competitor’s storefront to a dead end, know that anyone can report abuse and changes are logged.
Before long Google will let you edit more than just the location. You’ll be able to modify business information or add other details (which Google hasn’t detailed). Google has more features coming, such as: