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List of computer worms (interesting)

https://en.wikipedia.org/wiki/List_of_computer_worms

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What is a Computer Worm? CompTIA A+ 220-701 Exam Objectives

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In this free video Will from BeYourOwnIT.com explains what a computer worm is. A worm is similar to a virus in that it replicates, however, instead of replicating through computer files it spreads to different machines on a network. This is a great video for anyone who is studying for their CompTIA A+ Exam.

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Unlike a computer virus a worm can spread without changing the files of a computer and without affecting the boot sector of media. Worms also do not need to attach themselves to a program unlike viruses.

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Payload-free worms are worms that do not contain any code other than the code used to spread themselves. These worms are designed to simply spread and are not created to intentionally damage a host system. However the very act of transmitting worms around a network can cause severe disruptions as network bandwidth is filled or network traffic increased.

Payloads can take many forms as worms maliciously disrupt a system as with most malware. Types of payload involve making the worm...

Delete files on the host system

Encrypts files and demands payment to release them (ransomeware)

Send attachments via email

Create a 'backdoor' in an infected machine

Backdoors allow the worm creator to control an infected computer by bypassing authentication. These machines and their respective networks (called 'botnets) are often used to send spam and various junk.

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Worms are designed by people to transmit itself across a network to infect connected computers. Once on a computer the worm will attempt to spread itself on as many computers as possible.
The worm's primary purpose depends on it's payload.

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A worm is a self-replicating computer program that uses networks to spread itself to other computers, exploiting vulnerabilities in order to damage the functioning of the systems.
Worms can carry a 'payload' which is code designed to do more than just spread the worm.