What are the 4 hemispheres of the earth?

Excuse me, but could you elaborate on the four hemispheres of the Earth? I'm curious to know if you're referring to the geographical divisions based on latitude and longitude, specifically the Northern, Southern, Eastern, and Western Hemispheres. Could you explain the significance of each hemisphere and how they relate to our understanding of the planet's geography and climate? Additionally, is there a specific context or reason why you're bringing up this topic?