How is it Making sense of sys.objects, sys.system_objects, and sys.sysobjects?

- In this question I was writing a query using sys.sysobjects. However, one of the answers mentioned sys.system_objects. I'm just wondering what is the difference between these tables? sys.objects sys.system_objects sys.sysobjects

sysobjects has more things.

> SELECT count(*) FROM sysobjects; 2312 > SELECT count(*) FROM sys.system_objects; 2201 > SELECT count(*) FROM sys.objects; > 111 SELECT count(*) FROM sys.sysobjects WHERE NOT EXISTS ( SELECT 1 FROM sys.system_objects WHERE system_objects.object_id = sysobjects.id ); > 111