One of the key functions of a GIS is to visualize data through the use of maps. Maps allow us to see and analyze the spatial relationships between features in one or more layers. Maps are created for many different reasons. Often, they are used to show the location of specific assets or to highlight attributes associated with features such as a parcel's zoning classification or a pipe size. Sometimes, they are used to show the results of analysis we have performed.

So, each map you create in ArcGIS Pro has a reason to exist. This purpose will help to dictate what layers you choose to include and how those layers are visualized. There is no limit on the number of layers a map can contain. However, it is possible to have so many layers in a map that it distracts from the purpose. As the author of the map, you must strike a balance between the amount of information you include in a map and its overall purpose.

Each layer in a map has a set of properties. This includes...