Public Wi-Fi is an open or shared wireless network found in places like airports, hotels, cafes, and transit hubs. It is convenient, but it should be treated as less trusted than a private home or managed office network because the operator, nearby users, and network path may not be under your control.
In cyber security, public Wi-Fi matters because it can expose traffic, encourage fake hotspots, and make phishing easier to time and disguise. Attackers may try man-in-the-middle interception, rogue access points, or credential capture when users log in to email, banking, or work services. Defenders reduce risk by using a VPN on untrusted networks, preferring HTTPS sites, disabling automatic join, keeping devices updated, and avoiding sensitive work unless necessary. Public Wi-Fi is not always unsafe, but it should be assumed hostile until proven otherwise.