For all the pins added on the map, there is an option available to cluster them. [1]
By selecting the Cluster option, the pins will get clustered based on the proximity. It will make a group of nearby pins indicating the number of markers. [2]
Note:
On zooming in to the map, number of pins in the cluster decreases and you get to see individual markers on map. (left image) [3] [4]
Whereas, when zoomed out, it consolidates the markers into clusters again.
On clicking any cluster (no. of groups), it will show all the pins in spider cluster form. [5]