Definitions for Lab 3:

• Virus:
  "A software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer; 'a true virus cannot spread to another computer without human assistance'" (dictionary.com)
• Worm:
  "A computer worm is a self-replicating computer program, similar to a computer virus. A virus attaches itself to, and becomes part of, another executable program; however, a worm is self-contained and does not need to be part of another program to propagate itself." (wordiq.com)
• Spyware & Adware:
  "Any software taht covertly gathers information about a user while he/she navigates the Internet and transmits the information to an individual or company that uses it for marketing or other purposes" (dictionary.com)
• Firewall:
  "Any of a number of security schemes that prevent unauthorized users from gaining access to a computer network or that monitor transfers of information to and from the network" (dictionary.com)