Information Security Concepts Explained: Risk, Vulnerabilities, Threats & Controls (2026)

TL;DR Information security protects data and systems from unauthorized access, attack, theft, and damage through three core functions: prevention, detection, and recovery. The foundational vocabulary of InfoSec — risk, vulnerability, threat, and attack — has precise meanings that determine how defenses are designed and prioritized. A vulnerability without a threat is low priority; a credible threat against a critical vulnerability with no control is an emergency. Understanding this relationship