And, if you're interested, read on for more detail.
It works by providing a thin client over the web that you connect your regular browser to. The thin client provides an interface to a remote browser that you interact with the browser the public internet.
This is significant because the internet is a cesspool of attacks. Malware, ransomware, virii, tracking, exploited PDFs, ways to deliver device zero days over the web, browser zero days. All these things can lead to the security of your device and network being compromised, causing significant inconvenience, distress and loss for you.
BrowserGap and the RBI methodology acknowledges that not all threats can be detected and neutralized (such as by virus scanners), in order to face that reality, RBI adopts a "isolation" posture towards threats, effectively isolating them in the remote machine and preventing them from reaching your device.
With BrowserGap, in order to render the content of a web page, the only thing we send to your device form the remote page is pixels. So no HTML, CSS, JavaScript, etc from your browsing is ever executed on your device.
Cloud-based internet isolation is another name for this security practice and it is an emerging industry. Symantec recently acquired a company in this space, and Menlo Security was awarded[2] an agreement to build a CBII prototype for DISA, after a June 2018 request for RBI solutions that could eventually serve 60% of DoD's ~ 3 million users[0][1].
See more about RBI[1].
[0]: https://secureview.cloudbrowser.xyz/uploads/fileajqk.kkpgdih...
[1]: https://en.wikipedia.org/wiki/Browser_isolation
[2]: https://www.menlosecurity.com/press-releases-blog/disa-cloud...