The danger of public wifi
Potentially when you connect to Public WiFi without going onto VPN anyone else on that network could see:
Every site you visit
All information you send across the web (i.e. email or facebook messages)
You never know who is on a network and if they are snooping other users data. The simple solution here is to fire up UltraVpn prior to doing anything on the WiFi and connect to VPN. This encrypts all your outgoing traffic preventing other users on the WiFI seeing what you are doing.