UNIT IV: E-Security Systems      Threats to computer systems In  computer security , a  threat  is a possible danger that might exploit a  vulnerability   to breach security and therefore cause possible harm. A threat, in the context of computer security, refers to anything that has the potential to cause serious harm to a computer system. A threat is something that may or may not happen, but has the potential to cause serious damage. Threats can lead to attacks on computer systems, networks and more. v    Types Of Threats 1)     Virus: Virus is nothing but the software that can copy itself and can spread to other computers. In more technical terms, a computer virus is a type of malicious code or program written to alter the way a computer operates and is designed to spread from one computer to another. A virus operates by inserting or attaching itself to a legitimate program or document that supports macros in order to execute its code. In the process, a virus has the p