What is computer virus.What is WORM and many more a book which help you a lot..:)

 
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Computer worms are just one type of infectious software under the umbrella of malware. A worm can root itself deep within your computer if you don't take proper precautions against this strain of malware. Worms can arguably be one of the most dangerous types of malware because of its coding and the purpose behind its design
While the specific purpose of a computer worm varies depending on its code, in general a worm will usually make copies of itself so it can spread to other computers without anybody knowing. It can send email using an address book stored on the computer and it can inconspicuously open TCP ports to create holes in your security security. Because this kind of malware becomes so intertwined with the system files, it is easy for it to bypass your firewall and infect any other computer that your computer communicates with.