Advanced persistent threat (APT) or simply put an advanced threat, is a cyberattack designed to gain unauthorized and most important, undetected access to sensitive information or systems over an extended period. That too by using sophisticated techniques and tools. Most of the time, advanced threats come from skilled and well-funded attackers, such as state-sponsored actors, organized crime groups, or hacktivists.
APT is distinguishable from traditional cyberattacks because they focus on a specific target or organization and evade classic security measures. The goal of an advanced threat is usually to steal sensitive information, such as intellectual property, trade secrets, or financial data, or to disrupt the operations of a targeted organization. Because advanced threats can often go undetected for long periods, they can pose a significant risk to businesses and governments.