These sites typically operate as a "web proxy." You visit the proxy site, enter the URL of the YouTube video you want to watch, and the proxy server fetches the content for you.
The term "YouTube Unblocked 77" most likely refers to a proxy website designed to bypass internet filters and grant access to YouTube content. The number "77" may seem random, but it is a typical component of these services: the "77" may serve as a version number, a unique identifier to circumvent blocking algorithms, or it could be part of a network of proxy sites that are spun up with slightly different names to avoid being shut down.
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Services like NordVPN or ExpressVPN offer fast, secure connections specifically optimized for streaming. 2. Configure Your DNS Settings