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Advanced persistent threat describes groups that conduct prolonged and targeted cyberattacks. The “advanced” part means they use sophisticated tools, tactics, and often multiple stages of intrusion; the “persistent” part means they aim to stay inside a victim’s network for an extended period, quietly maintaining access and proceeding with their objective over months or even years. The emphasis on targeting means these actors focus on specific organizations or sectors, collecting intelligence, exfiltrating data, or compromising critical systems rather than spraying indiscriminately.

This is different from random cyber incidents, which are unsystematic and not aimed at a particular target, or short-term phishing campaigns, which don’t establish a long-term foothold. Unsolicited hardware failures describe a physical issue rather than a deliberate attacker. In short, an APT represents a deliberate, well-resourced adversary that plans and executes sustained campaigns against chosen targets.