Security refers to the measures and practices implemented to protect individuals, organizations, and systems from harm, unauthorized access, theft, or damage. It encompasses a wide range of activities and domains, including physical security, which involves guarding tangible assets and facilities; information security, which focuses on protecting data and information systems from breaches and cyber threats; and personal security, which pertains to the safety and well-being of individuals.

In a broader context, security can also refer to the collective strategies and policies designed to ensure stability, safety, and resilience in society against various threats, including crime, terrorism, and natural disasters. It involves risk assessment, resource management, and the establishment of protocols to respond to incidents effectively.

Overall, security aims to create a safe environment where people and assets are shielded from potential dangers, thereby fostering trust and enabling productivity and growth.