What is a longitude?

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is measured in degrees, with the Prime Meridian (located in Greenwich, England) serving as the reference point for zero degrees longitude. Longitude lines run from the North Pole to the South Pole and are used in conjunction with latitude to pinpoint a specific location on the Earth's surface.

Are imaginary lines that run from the North pole to the South pole