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Google Maps is a map service that you view in your web browser. Depending on your location, you can view basic or custom maps and local business information, including business locations, contact information, and driving directions. Click and drag maps to view adjacent sections immediately. View satellite images of your desired location that you can zoom and pan.  Google Maps can be accessed at maps.google.com.  To get acquaint yourself with Google Maps, check out the Google Maps User Guide which includes everything you need to get started using Google Maps.  The Map Tutorials are excellent for getting a feel for what is available from Google Maps.

A mashup, as defined by Wikipedia, is a "web application that combines data from more than one source into a single integrated tool."  While not exclusive to maps, one of the more common applications is using data from Google Maps in combination with data from other sources, such as real estate listings, photos, and so on.  In this thing, you can explore