A secret or hidden way to enter a place or system, often without permission, or a rear entrance to a building.
Compound of 'back' and 'door,' literally describing a door at the back of a building. In modern computing, 'backdoor' refers to a hidden entry point that programmers leave to secretly access software.
Computer hackers love to create 'backdoors' in programs so they can sneak in later, which is why cybersecurity experts spend so much time looking for hidden code that creators left behind—it's like finding secret passages in a castle!
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