Why is the system of parallels and meridians on maps called a degree grid? What is it for?

The graticule is a system of meridians and parallels. Meridians are invisible lines that traverse our planet vertically in relation to the equator. Meridians begin and end at the poles of the Earth, connecting them. Parallels are invisible lines that are drawn conventionally parallel to the equator. Thanks to the degree grid, we can calculate the longitude and latitude of an object on a map, which means we can find out its geographical location.

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