Wi-Fi security refers to the measures taken to protect wireless networks from unauthorized access and data breaches. It involves using protocols and encryption methods to secure the information transmitted over the network. Common security protocols include WPA2 and WPA3, which help ensure that only authorized users can connect to the network. To enhance Wi-Fi security, users should create strong passwords, regularly update their router firmware, and disable features like WPS that can be exploited. Additionally, using a VPN can provide an extra layer of protection by encrypting internet traffic, making it harder for attackers to intercept data.