The Western Hemisphere is a geographical term for the half of Earth which lies west of the prime meridian (which crosses Greenwich, London) and east of the antimeridian.
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Eastern Hemisphere: This is everything on the other side of that imaginary pizza-cutting line - east of Greenwich and west of its opposite point.
Equator: An imaginary line drawn around the middle of Earth, equally distant from both poles. Like wearing a belt in middle position on your waist.
Prime Meridian: The earth's zero degrees longitude line, passing through Greenwich in London. It’s like drawing a vertical line down at center in your pizza to divide it into two equal halves.