How does my ISP (that has an offer on data only for a specific website) know that I am using the internet for that specific website and not others?
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The internet works off of “IP Addresses”. Each site has one or more, and their owners are all known. When you connect to, for example, “example.com”, you send packets of data to the site; each packet includes the “IP Address” (which for example.com is 2606:2800:220:1:248:1893:25c8:1946)
The “IP Address” is necessarily exposed to the ISP — indeed, it’s the entire job of the ISP to take all the packets that you are sending, and then route them over to where-ever they are going based on the IP Address.
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