A backdoor Trojan is a sneaky, digital intruder breaking into your system without an invite. It pretends to be a legit program, spreading through phishing tricks and luring users to click on bad links or visit malware-infested websites. It creates a secret “backdoor” into your system, giving cybercriminals easy access to your private data and control over your device. Once it’s in, it can snoop on your files, send and receive data, and even stalk your browsing history. Yikes! It’s like that sneaky friend who finds a hidden entrance to your house and throws a wild party without your permission. To fend off these digital trespassers, keep your system updated with the latest patches and rock some solid anti-malware armor.