Just as we use Latitude and Longitude to locate any place on earth, in a similar way, Universal Transverse Mercator (UTM) is a grid based method to locate any place on the surface of earth in a two-dimensional form.
So what is latitude and longitude ?
Lines of latitude are circular bands running east and west parallel to the equator. They are designated from zero to 90 degrees north and south of the Equator.
Lines of longitude are circular bands which run north and south through the two poles. They are designated from zero to 180 degrees east and west of the Greenwich Observatory in London, England. 
