Did you know that a circle is the most effective and efficient way to present point data?
But what happens when there are so many events on a map that your points become a blob? Point clustering is a way to make it easier to extract meaningful information from your data.
Point clustering is supported for up to 50,000 points in ArcGIS Online web maps for hosted feature layers, ArcGIS Server 10.3.1+ point features layers that support pagination, CSV layers, and feature collections.
For more information, check out the Configure Clustering documentation online. Keep in mind that you will want to ensure that your symbol styles look good when scaling up or down.
The screenshot on the left shows all crime points. The screenshot on the right shows clusters of crime data and uses size to represent the number of events at a determined scale.