About this interactive
Every URL follows the uniform resource identifier format: the scheme (the protocol, such as https), then optional user info ending in an @, then the host, an optional :port, and then the path, query (after ?) and fragment (after #). Only the host decides where the browser goes; DNS turns it into the IP address the packet is sent to. The video's title says "Universal"; URL stands for Uniform Resource Locator.
To find the host, look between the // and the first /, ?, or #, and if there is an @ in that stretch, the host is what comes after it. Then read the domain from the right. accounts.tradewind.example is the bank's; tradewind.example.login-check.example belongs to login-check.example.
Attackers use that format to trick users: a trusted name as user info in front of an @, a trusted name as labels in front of their own domain, or a trusted name in the path. URL scanning, part of web filtering, checks for those tricks. An @ after the host, in the query or fragment, is harmless.
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