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Named after the Trojan Horse (Greek history), a trojan is a network software application that prefers to remain hidden on an installed computer. Trojans sometimes, for example, access personal information stored locally on home or business computers, then send these data to a remote party via the internet. Alternatively, trojans may serve merely as a “backdoor” application, opening network ports to allow other network applications access to that computer. They typically do NOT try to infect others once they are in your system. You will typically pick up a trojan from visiting an infected website.

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