Spybot - Search & Destroy is an on-demand spyware and malware scanner. That means it scans for threats whenever you choose to do so. It also offers some preventive measures like its Immunize function.

Resident, of which TeaTimer is a part, is Spybot-S&D's permanently running partner that does on-access scanning. This means that it will instantly detect and counteract to threats and unsolicited system settings changes.