What are the four types of security?

What are the four types of security can be categorized in several ways, but a common classification includes physical security, cybersecurity, information security, and operational security. Physical security protects tangible assets like buildings, equipment, and people from theft, vandalism, and harm using locks, guards, cameras, and barriers. Cybersecurity protects digital systems, networks, and computers from hacking, malware, and cyberattacks using firewalls, antivirus, and encryption. Information security protects confidentiality, integrity, and availability of data regardless of whether it is digital or paper, focusing on data itself through access controls and classification. Operational security or OPSEC protects day to day business processes, supply chains, and sensitive activities from being observed by adversaries. Another common four types model includes personal security protecting individuals, financial security protecting economic stability, national security protecting country from external threats, and enterprise security protecting organization. Some frameworks list network security, application security, endpoint security, and cloud security as four types within cyber domain. Understanding four types helps create layered defense covering physical, digital, data, and procedural aspects of security rather than focusing on only one area.