Maps are drawn according to a ____________.
Answer: Legend
As per legend, maps are drawn. A list of icons, text and colours which are used to describe the map is the term legend with respect to maps. We may assume that the patterns and symbols which is used on the map are a visual description.
Without legend, it would be hard to understand that the representation of a river is a short section of a blue sinuous line, or that the shopping cart symbol represents a mall, a vegetable marketplace or a small clothes shop.