Main Features:
1. Login Items: Manageable list of applications that are launched automatically every time you log in.
2. Launch Agents: Some applications installed on your Mac come with small helper apps (launch agents). These apps broaden functionality of a parent product, but you may consider removing or disabling them in some cases.
Q: What's the reason that some login items can be deleted, but other items cannot be deleted?
A: The item which is part of its application cannot be removed independently.