Worm

Worm- A software program capable of reproducing itself that can spread from one computer to the next over a network.
(Definition via google)

Virus

Virus- A software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer.
(Definition via google)

Urban Legend

Urban Legend- A story that appears mysteriously and spreads spontaneously in various forms and is usually false.
(Definition via google)

Trojan Horse

Trojan Horse- A program that appears desirable but actually contains something harmful.
(Definition via google)

Time Bomb

Time Bomb- A computer program that has been written so that it will stop functioning after a predetermined date or time is reached.
(Definition via google)

Teleconferencing

Teleconferencing- A conference of people who are in different locations that is made possible by the use of such telecommunications equipment as closed-circuit television or webcam.
(Definition via google)

Tagging

Tagging- A non-hierarchical keyword or term assigned to a piece of information.
(Definition via google)

RDF Summary

RDF Summary- An XML format used to syndicate news, blog posts, forum threads, and other content among different web sites.

(Definition via google)

Pyramid Schemes

Pyramid Schemes- A non-sustainable business model that involves the exchange of money primarily for enrolling other people into the scheme, without any product or service being delivered.
(Definition via google)

Phishing

Phishing- The criminally fraudulent process of attempting to acquire sensitive information such as usernames, passwords and credit card details by masquerading as a trustworthy entity in an electronic communication.
(Definition via google) 

Netiquette

Netiquette- A set of social conventions that facilitate interaction over networks, ranging from Usenet and mailing lists to blogs and forums.
(Definition via google) 

Logic Bomb

Logic Bomb- A set of instructions inserted into a program that are designed to execute (or `explode') if a particular condition is satisfied.
(Definition via google) 

Hoax

Hoax- This usually consists of an email message warning recipients about a new and terribly destructive virus.
(Definition via google)

Fraud

Fraud- The crime of obtaining money or some other benefit by deliberate deception.
(Definition via google)

Filtering

Filtering- A computer program to process a data stream.
(Definition via google)

Windows Mail

Windows Mail- An e-mail and newsgroup client included in Windows Vista, that was superseded by Windows Live Mail.
(Definition via google)

User Agent

User Agent- A user agent is a client application implementing a network protocol used in communications within a client-server distributed computing system.
(Definition via google) 

Text Messaging

Text Messaging- The exchange of brief written messages between mobile phones over cellular networks.
(Definition via google)

Spam

Spam- Unwanted e-mail (usually of a commercial nature sent out in bulk)
(Definition via google)

Signature

Signature- Method of signing a return electronically through use of a Personal Identification Number (PIN).
(Definition via google)

Packets

Packets- a message or message fragment.
(Definition via google)

Mailing List

Mailing List- A collection of names and addresses used by an individual or an organization to send material to multiple recipients.
(Definition via google)