Wireless security encompasses the protocols, techniques, and defensive measures used to protect wireless networks and devices from unauthorized access and attacks. Operating at the physical and data link layers, wireless networks face unique vulnerabilities compared to wired infrastructure — including signal interception, authentication bypass, and protocol exploitation. Understanding both defensive configurations (WPA2/WPA3, 802.1X, proper encryption) and offensive techniques (deauthentication, evil twin, KRACK) is essential for securing modern wireless deployments. A critical insight: most wireless compromises succeed not because of protocol weaknesses, but because of misconfigured or legacy settings that expose enterprise networks to trivial attacks.