It's always a gamble when you send information over the Internet. It could get stolen, or the NSA could be watching!
There are tools to help - for example, the browser extension HTTPS Everywhere will make sure you only use secure, encoded sites for sensitive info.
Now, Google is going a step further by locking down the Chrome browser end-to-end.
The browser extension, called End-To-End, is still in the development stages. When done, it will make sure that anything leaving your browser is encoded, and will arrive encoded to wherever it's going.
Google is releasing the code now for folks to beta-test it and make sure it works correctly.
Once we feel that the extension is ready for primetime, we’ll make it available in the Chrome Web Store, and anyone will be able to use it to send and receive end-to-end encrypted emails through their existing web-based email provider.
This is just one more reason to use Chrome, a solid, quick browser. Not sure what browser you're using? Find out here, and see if it needs updating.