Maps & globes show the approx location of a certain place. But they are not completely correct.
Latitudes are the horizontal lines across the globe. 0 degree latitude is known as equator, the imaginary line which separate the globe into Northern & Southern Hemispheres. 90 degree north is known as north pole & 90 degree south is known as south pole.
Longitudes are the vertical lines across the globe. They are also known as Meridians. 0 degree longitude is known as prime meridian, the imaginary line which divide globe into eastern & western hemispheres. It passes through Greenwich in London.
Latitudes & longitudes help in locating a certain place in a map or a globe.