| Things You Should Know!! |
| Weed - is a program (or anything in the system) that uses such a small amount of resources that it's often not cost-effective to do anything about it. |
| Freeloader - is a program that uses some system or server resources to survive and possibly benefit its creator, without paying for them |
| Flying Dutchman - is a freeloader that spawns a copy of itself just before termination |
| Zombie - is a program that continues to consume some resources anyway, even after its termination, due to delays in cleaning all associated resources |