What Is My ISP, and What Can It Actually See?
Your ISP (internet service provider) is the company that physically connects your home or phone to the internet -- and by definition, every request you make passes through its network first.
What your ISP can see without a VPN
Even with most sites using HTTPS today, your ISP can typically see which domains you connect to (via DNS lookups and the destination IP of each connection), roughly how much data you use and when, and which of its own network nodes you're routed through -- which is usually enough to build a fairly detailed picture of your habits, even without reading the actual content of encrypted pages.
What HTTPS does and doesn't hide
HTTPS encrypts the contents of a page and the specific path you request on a site, so your ISP generally can't see exactly which article you read on a news site. It does not, by default, hide which site you connected to in the first place -- that's visible at the connection and DNS level regardless of HTTPS.
How a VPN changes this picture
Once you're connected through a VPN, your ISP sees a single encrypted connection to the VPN server and nothing about the individual sites or services you reach beyond that point. The VPN provider becomes the party technically capable of seeing that routing information instead -- which is exactly why a provider's own logging policy matters as much as the encryption itself.
Total Pro VPN's network is built to avoid keeping browsing-destination logs in the first place, so that shift in who could theoretically see your traffic doesn't just move the problem around.