Anti-malware software can defend you against viruses and other malware threats including Trojans, worms and, depending on the product, spyware.
Anti-spam programs can detect unwanted email and prevent it from reaching user inboxes.
Appliances are a combination of hardware and software security elements in one solution. This lets you plug appliances in rather than installing the software separately.
Application control allows you to control the use of applications that may be inappropriate for use on business computers or networks.