They put down their rivals easily that night, destroying Troy and taking back Helen for Greece. Masquerading as something useful or interesting, the malicious trojan horse program hides deadly and varied payloads for computer systems and their critical data - unbeknownst to the users. Trojans are not the only worries facing corporations, e-businesses and the countless other Internet users these days. Worms, too, are wreaking a far too costly bedlam on businesses everywhere. Though the derivation of their name does not have such a fascinating history, worms ignite similar fears in potential victims, as do trojans.
Worms are like viruses in that they reproduce and spread.
Many industry experts make a distinction between the two in that the virus is dependent upon a host, such as a file or boot sector, to dispense its payload. It must rely on the transfer of files between machines to spread. A worm, on the other hand, is an independent bugger. It propagates of its own free will through network connections. The most popular misconception is that traditional viruses and trojan horses are causing the same damage.