Co-browsing is browser-based, meaning that you only share the browser instead of sharing your entire screen (which is the case with screen sharing). 

Both technologies come with their own approaches. Co-browsing solutions like Surfly use a Javascript approach, which means that the HTML, Javascript, and CSS of a website are synchronized between users. This allows you to extend the online experience to multiple users, and therefore add a multi-user experience on your website.

Screen-sharing solutions are pixel-based, the drawback of this approach being that screen updates are slow and of low quality. Most screen-sharing tools require external software to be installed by users. This makes it unsuitable for most web situations, as people are often unwilling to install extra software that circumvents the browser's security measures.

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