Hotspot shield is a proxy software. It hides your IP address. It is a free VPN software. When run this software it gives a new IP which is created by Hotspot shield VPN (virtual private network) service. You can use this software for free. This free service adds advertisements to your browser, so irrespective of which ever site you visit you will see advertisements of Hotspot shield. It is not compulsory. You will have a close button on top right, so you can close it if you want and still you can use their virtual private network service for free. This service is mainly used for anonymous surfing. Anonymous surfing means that though you surf internet no one will be able to track you because you are using fake IP address. This is not illegal. But the purpose you use will decide it. You can listen to Pandora radio outside United States. Watch Hulu etc. Hotspot shield is also fast. It is free service too. This could the best free virtual private network service. It guarantees you that your information will be kept private and safe. For more information you can logon to anchorfree.com.