If you want privacy and anonymity on the web from over hyper big brothers. If you want to unblock Youtube or other similar sites blocked by your government. If you want to see unfiltered and unaltered results from Google and other search engines that might be censored, then TOR is a great solution for your needs.
In their own words:
Tor protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, and it prevents the sites you visit from learning your physical location.
What makes Tor really powerful is that if you are a political activist, say in China, India, Pakistan etc and do not want your government eavesdropping on your activities, you can make yourself anonymous on the web instantly. Granted, it is not hack proof but it does give you the ability to be private on the internet.
The best thing about Tor is that it is completely opensource. And it is available for all major operating systems including Android powered mobile phones. Therefore, port for Ubuntu, Redhat, Mac OSX and Microsoft Windows is also available. And those of us who would like to tinker with the source files and compile our version, we can also download the actual source.
Tor is not designed to make your computer invisible on the internet automatically. It is purpose built to only encrypt/anonymize the browser traffic which is configured with Tor. So essentially, one has to be careful before installing it and running any application through it.
Tor has been written up extensively in the news media primarily because many political activists and underground organizations have used it to circumvent government blockages and traces. It has been used extensively during the Arab Spring by change makers and their likes. It is also known to have been used to circumvent Youtube blockages by governments around the globe.
The software is freely available from Tor project website and can be downloaded.
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