Why do people in the northern hemisphere see different constellations than people in the southern hemisphere?

People in the northern and southern hemispheres see different constellations due to the curvature of the Earth and its position in space. Each hemisphere has a different vantage point, which means that certain stars and constellations are obscured by the Earth itself for observers on the opposite side. Additionally, some constellations are located closer to the celestial poles, making them visible only from specific latitudes. As a result, the night sky appears distinct in each hemisphere.