Under All Users tab, app owners/moderators can send push notifications to all app users.
Through Specific User push notifications section, app owners/moderators can send push notifications to specific users.
In User group push notifications, app owners are allowed to send push notifications to specific User Groups.
Geographic push notifications provide you facility through which you (app owner) can send push notifications to app users in a specific geographical area instantly or on a scheduled time.
Geo-Fencing push notifications allows you to preselect the area and provide default push notification message, which will be delivered once any app user enters the Geo-fenced area.