Tor protects you against a common form of Internet surveillance known as "traffic analysis." Traffic analysis can be used to infer who is talking to whom over a public network. Knowing the source and destination of your Internet traffic allows others to track your behavior and interests. This can impact your checkbook if, for example, an e-commerce site uses price discrimination based on your country or institution of origin. It can even threaten your job and physical safety by revealing who and where you are. For example, if you're traveling abroad and you connect to your employer's computers to check or send mail, you can inadvertently reveal your national origin and professional affiliation to anyone observing the network, even if the connection is encrypted.
What's new in this version:
Most notably, this release features fixes for regressions caused by our font fingerprinting defense: chinese users should have a functional Tor Browser again and emoji support is restored on OS X and Linux systems (we are still working on a fix for Windows). Moreover, we fixed an oversight in one of our patches which broke some websites depending heavily on iframes.