Tor Browser is free software and an open network that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security.
Tor Browser 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. Also it prevents the sites you visit from learning your physical location. And it lets you access the blocked websites.
The Browser lets you use Tor on Windows, MacOS, or Linux without needing to install any software. It can run off a USB flash drive, comes with a pre-configured web browser to protect your anonymity, and is self-contained (portable).
Don’t torrent over Tor
Torrent file-sharing applications ignore proxy settings and make direct connections even when they should use Tor. Even if your torrent application connects only through Tor, you will often send out your real IP address in the tracker GET request, because that’s how torrents work. Not only do you deanonymize your torrent traffic and your other simultaneous Tor web traffic this way, you also slow down the entire Tor network for everyone else.
Don’t enable or install browser plugins
The Browser will block browser plugins such as Flash, RealPlayer, Quicktime, and others. They can manipulate into revealing your IP address. Similarly, do not install additional addons or plugins into the Tor Browser, as these may bypass Tor or otherwise harm your anonymity and privacy.
Use HTTPS versions of websites
Tor will encrypt your traffic to and within the Tor network, but the encryption of your traffic to the final destination website depends upon on that website. To help ensure private encryption to websites, the browser includes HTTPS Everywhere to force the use of HTTPS encryption with major websites that support it. However, you should still watch the browser URL bar to ensure that websites you provide sensitive information to display a blue or green URL bar button.
Don’t open documents downloaded through Tor while online
The Tor Browser will warn you before automatically opening documents that are handled by external applications. DO NOT IGNORE THIS WARNING. You should be very careful when downloading documents via Tor (especially DOC and PDF files).
Use bridges and/or find company
Tor tries to prevent attackers from learning what destination websites you connect to. However, by default, it does not prevent somebody watching your Internet traffic from learning that you’re using Tor. If this matters to you, you can reduce this risk by configuring Tor to use a Tor bridge relay rather than connecting directly to the public Tor network.