Answer:
Hemisphere
Explanation:
Hi, a half of the world is called Hemisphere.
The divisions can be latitudinal or longitudinal.
The Equator, or line of 0 degrees latitude, divides the Earth into the Northern and Southern hemispheres.
The prime meridian, or 0 degrees longitude, divides the Earth into Eastern and Western hemispheres.
Feel free to ask for more if needed or if you did not understand something.