Purpose of XPCservices and Agent related to an Application

[myitrumors]

Just for general knowledge what is the purpose of XPCServices and Agent related to a specific application? I will try to give you an example.

I noticed when I launch the Calendar Application I see the following 2 processes running:

/System/Library/PrivateFrameworks/CalendarNotification.framework/Versions/A/XPCServices/CalNCService.xpc/Contents/MacOS/CalNCService

/System/Library/PrivateFrameworks/CalendarAgent.framework/Executables/CalendarAgent

 

[Taz Mangus]

XPC services on macOS app using Swift

Before XPC we used to pick up Sockets and Mach Messages (Mach Ports).

medium.com