It's a kind of computer virus
Well Ben, did you ever learn about the trojan war? The Trojans fought and protected their city against the Greeks, but they finally lost when their enemies built an enormous wooden horse and hid a group of soldiers inside it. The Trojans thought it was a peace offering, so they brought it into the city and had a big party. Then, in the middle of the night, while everyone was asleep, the soldiers climbed out of the horse and opened the city gates, letting in the Greek army. The Trojans were defeated because they were so gullible.
In computer terms, a "Trojan Horse" is a computer virus that is designed to fool people, just like the Trojans were fooled. It may be a program that is supposed to do something helpful, but really is also doing some unhelpful things.
Maybe you get an email that says "The attached file is an update from Microsoft. Open it to update your computer." Only, it's not really an update from Microsoft--it's a program that deletes all the files on your computer. But you believe the message, so you open the file.
Now you're just like the Trojans. You thought you had something nice, but it turns out to be very nasty instead. That's a Trojan Horse.
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