Spock is a type of computer virus that infects computers by attaching itself to files or programs and replicating itself throughout the system. It can spread through email attachments, infected websites, or shared files on a network. Once a computer is infected with Spock, it can cause various problems such as slowing down the system, corrupting files, and stealing personal information. It is important to have up-to-date antivirus software to protect against Spock and other viruses.