Maps.com :: World's largest map store :: wall maps, travel maps, atlases, digital maps and more.
http://www.maps.com/

Provides directions, interactive maps, and satellite/aerial imagery of the United States. Can also search by keyword such as type of business.
http://maps.google.com/

Yahoo! Maps, Driving Directions, Satellite View and Traffic. Rated the best online mapping experience.
http://maps.yahoo.com/

Use MapQuest for driving directions and maps. See local traffic and road conditions, find nearby businesses and restaurants, plus explore street maps and satellite photos.
http://www.mapquest.com/

A map is a visual representation of an area?a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes.
http://en.wikipedia.org/wiki/Map