Depends on the type of map you're looking at. Be more specific.
world map
Different colors on a map typically represent different categories or types of data. For example, in a topographic map, different colors may indicate varying elevations. In a thematic map, colors may represent different levels of a particular variable, such as population density or average temperature.
By adding a mod such as the Color Map Mod
all the colors
choloropleth
represent
the part of the special-purpose map tells what the colors on the map mean is the key. the reason is because on the "Special-Pourpose Map" because the type of key there is on the map is called "Climate Regions".
colors
legend
mountain ranges
Map colors refer to the use of different colors on a map to represent different categories, themes, or data. For example, a map might use green to denote forests, blue for water bodies, and red for urban areas. Color coding helps make the information on a map visually clear and easy to interpret.
so you can know what the colors on the map means