Topology describes the way interrelated features are organized and connected. In ArcGIS Pro, it is implemented as a collection of spatial rules that are used to constrain active edits or audit and maintain the correctness of features based on their position relative to other features.
There are two types of topology from which to choose: map topology and geodatabase topology. Using one or both can help you manage and maintain the accuracy of your feature data with respect to coincidence, adjacency, containment, and connectivity.