Spybot is a free anti-malware software developed by Safer-Networking Ltd. It was first released in 2000 and has since become a renowned tool for detecting and removing spyware, adware, trojans, and other types of malware from computers. Spybot works by scanning your system for malicious software and providing options to remove or quarantine detected threats. Its comprehensive scanning capabilities and user-friendly interface make it a popular choice among computer users.