The Equator represents the great invisible circle around the Earth that is everywhere equidistant from the geographic poles

and lies in a plane perpendicular to the Earth's axis. The Equator divides the Earth into the Northern and Southern hemispheres. In other words, it is the line with 0° latitude.

Why is the line called the equator?

The name "equator" is Latin for "even-maker"; at equator the day and night are exactly the same length around the year. ... The equator divides the surface into the northern hemisphere and the southern hemisphere.

Why is the equator and imaginary line?

These lines are important, because they help people navigate and measure time. The equator is an imaginary line drawn right around Earth's middle, like a belt. It divides Earth into the Northern Hemisphere and the Southern Hemisphere.