| Trojan or Trojan Horse
is a general term that refers to programs that appear
desirable, but actually contain something potentially
harmful. It gets its name from the Trojan Horse
that was an instrument of war used by the Greeks
to gain access to the city of Troy. It looked like
a gift of a giant wooden horse, but actually concealed
soldiers inside.
The harmful contents could be anything, for example
you may download what looks appears to be a free
game, but when you run it, it opens up a port
on your computer where a hacker can "remote
control" your machine. A trojan's may also
carry other payloads co-like a virus or worm,
which then spread more damage.
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