* North and South: Half of the Earth divided north and south is called a hemisphere. We have the Northern Hemisphere and the Southern Hemisphere.

* East and West: Dividing the Earth east and west is a bit more complicated. You can't really have a clean "half" in this way. Here's why:

* Prime Meridian: The Earth is divided into hemispheres based on the Prime Meridian, which runs through Greenwich, England. It separates the Eastern Hemisphere from the Western Hemisphere.

* No Exact Cut: However, there's no single line that perfectly cuts the Earth in half east and west. Every line of longitude (running north-south) would eventually divide the Earth into roughly equal halves.

So, the answer depends on what you're looking for:

* Hemisphere: A hemisphere is a half-sphere, typically referring to the north and south divisions.

* East and West: There's no single "half" in this direction, but lines of longitude can divide the Earth into roughly equal halves.