An Advanced Persistent Threat (APT) is a prolonged and targeted cyberattack where skilled attackers, often state-sponsored, infiltrate a network and remain undetected for extended periods. Unlike typical cyber threats that aim for immediate gains, APTs focus on long-term objectives like espionage or disruption. Commonly targeting high-value sectors such as government, finance, and healthcare, APTs employ sophisticated techniques, making detection and defense challenging for organizations. Understanding APTs is crucial for effective cybersecurity strategies.