Please help me understand a coordinate system and how a coordinate system is relevant to a region of interest such as South Africa. I came across this term a couple of times and overlooked it because I don't really know what it refers to.
A good starting place for GIS terminology is the GIS Dictionary hosted by Esri.
A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions. The Cartesian coordinate system and the geographic coordinate system used on the earth's surface are common examples of coordinate systems.