Google Maps is a desktop web mapping service developedby google that uses electronic version of map whichcan be accessed through internet by a receiver thatreceives the real map ofearth'ssurfacecapturedby the satellite.

Geographical Information System (GIS) is the system ofcapturing, storing, checking and displaying the data relatedto the positions on earth'ssurface through computersystem that enable us to see, analyzeand understandthemap moreeasily.

Roger Tomlinson is considered as the father of GIS.

The U.S. department of defense (DoD) developed GPS andit was developed in 1973 AD.

Roger L. Easton, Ivan A. Getting and Bradford Parkinson are credited for invention of GPS.

The full form of GIS and GPS are:
-GIS: Geographical Information System.
- GPS:Geographical Positioning System.

Conventional signsare the different symbols that areused to represent the facts on the earth within themap.

Cartography is the art of drawing maps with thedifferentconventional signs and symbols to representthe facts on the map.

The types of scale are:
-Statement scale.
-Graphical scale.
- Ff scale.

A map is a representation of a portion on the wholeearth on the small sheet of paper with the fixedscale and symbols.