Equirectangular projection

The equirectangular projection (also called the equidistant cylindrical projection or la carte parallélogrammatique projection), which includes the special cases of the Gall isographic projection and the plate carrée projection (also called the geographic projection, lat/lon projection, or plane chart), is a simple map projection attributed to Marinus of Tyre who, Ptolemy claims, invented the projection about AD 100. The projection maps meridians to vertical straight lines of constant spacing (for meridional intervals of constant spacing), and circles of latitude to horizontal straight lines of constant spacing (for constant intervals of parallels).

Source: Wikipedia — Equirectangular projection (CC BY-SA 4.0)