Part of macOS

`apsd`Push notifications

○ Leave it

Receives notifications from Apple’s servers for your apps.

What it is

Keeps one connection open to Apple’s push service so apps can get notifications.

If you stop it

macOS starts it again straight away. Leave it.

○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.

From Procession’s guide, in the words the app shows.