When out and about it's tempting to blindly connect to the first 'FREE' WiFi network you come across, but wait! Is that 'FREE' network a genuine WiFi Hotspot?
A common method used by hackers to get hold of your personal data or even bank or credit card credentials is a 'Man-in-the-middle' attack. The hacker set's up a WiFi hotspot designed to look official waiting for unsuspecting members of the public to connect and unwittingly hand over all their personal data. ...and don't think you're safe on your smartphone or tablet because YOU'RE NOT! Phones and tablets CAN also be hacked!
See my post on AntiVirus Software... Don't get ripped off!