This is the software publisher's description.

Sure, public networks (both wired and wireless) are great. After all, what would life be without connecting while at airports, hotels, coffee shops and more. But while you're connecting to any open network - even if you pay an access fee from a recognized provider, you’re still at risk of insecurely sending your data over the wires and airways. Your passwords, credit card numbers, and any data you send can be seen and associated with you personally. Standard antivirus software won't protect you as this threat is on the network, not your laptop or iPhone.

That's why AnchorFree is pleased to offer Hotspot Shield. This free privacy/security software keeps your Internet connection secure and anonymous on public networks: including hotels, airports, coffee shops, even work and home.

Hotspot Shield creates a virtual private network (VPN) between your laptop or iPhone and our Internet gateway. This impenetrable tunnel prevents snoopers and hackers from viewing your email, instant messages, credit card information or anything else you send over the network. This means you’ll remain anonymous and secure while on-line. Hotspot Shield security software is free to download, employs the latest VPN technology, and is easy to install and use.