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.
Antivirus software is a program or set of programs that are designed to prevent, search for, detect, and remove software viruses, and other malicious software like worms, trojans, adware, and more.
McAfee VirusScan is an antivirus program created and maintained by McAfee, Inc. (formerly known as Intel Security, and Network Associates prior to that). It is not available as a standalone package, but is included in McAfee LiveSafe, McAfee AntiVirus Plus and McAfee Total Protection. Visit mcafee.com/activate to get protected with mcafee antivirus.
McAfee Antivirus includes many features at decent prices. The protection level is decent enough for most users. Updates are provided regularly, and the entire updating and maintenance process happens in the background, without the need for user intervention or interference with the tasks on the computer.