In practice, Hotspot Shield creates a private network (VPN) between your computer or iPhone and your Internet output, thanks to which you can be completely protected from snoopers, hackers, or ISPs, and from any suspicious activity that can affect your privacy and security.
In addition, the program doesn't require any kind of complicated configuration nor does it have dozens of options that will get you tangled up. It will simply run, notify you from a browser window that your connection is secure, and you're good to go. It's as easy as it is effective.
Hotspot Shield is a very useful tool for users that like to have complete Internet privacy, or that want to access websites that are normally restricted due to their geographic location.