Wi-Fi gives us freedom from wires, but it’s not secure by default. Unless you enable encryption, people nearby can easily connect to your network. They could possibly access your PCs and files if they wanted to, they could access your files and accounts. You can use any of several separate protocols that provide different levels of security: WEP, WPA, and WPA2. The Personal mode of WPA/WPA2 is easier to set up, but is subject to brute-force dictionary cracking.”]