A dot map is a type of map that has dots marked on it according to the numeric-variable. The higher concentration of dots represents the higher is the amount of numeric-data in that area of the map. It shows data on a granular level characterized by color on the map.
Why do you need it?
We need a dot map to have an attractive and pleasant visualization of the geographical data. The visualization is in such a way that all the categories of data show different colors that make them easy to spot effectively.
What kind of data you can visualize with it?
If you have a dataset whose categories are distributed all over a region, then this chart is beneficial. Assume you have a dataset of branches like clothing, restaurants, sports-shop of your business, then using a dot map, you can see the distribution pattern of business. Where every branch shows a different color and every dot represents a single shop of its respective branch.