[vengefulduck]

They can usually still see Domain names. DNS traffic is normally sent in the clear and in the event it’s not the SNI field in TLS (https) is unencrypted. So your ISP can know which domains you visit but not the individual sites on those domains you visit. (i.e they would know you visited google.com but not that you requested the page: google.com/q=your+question) Which depending on the site might not be all that sensitive but I’m sure you can think of a few examples of sites you wouldn’t want anyone to knowing you went to even if they couldn’t see which page.