The communities feature was introduced during the 3.00 update in 2015. The communities heading functions as a gathering point for players with the same interests. For example, there is a notice board for general discussions, screenshots can be shared and group discussions can be held.
Sony already stopped maintaining the PlayStation Communities app on Mobile Devices. Moments later, patch notes were shared stating that the PlayStation 4 version of the feature will also be discontinuing in the near future.