Public Wi-Fi refers to wireless internet access that is available to the general public, often found in places like cafes, libraries, airports, and parks. It allows users to connect their devices, such as smartphones and laptops, to the internet without needing a personal data plan. While convenient, public Wi-Fi can pose security risks, as it may not be encrypted. This means that sensitive information, like passwords and personal data, can be vulnerable to hackers. Users are advised to take precautions, such as using a virtual private network (VPN) or avoiding sensitive transactions while connected to public networks.