FTTH and FTTP are one and the same thing. They stand for Fibre-to-the-Home and Fibre-to-the-Premises. FTTP is a more popular term and you’re likely to see this one being used than FTTH.
So what is it? It is a fibre broadband connection that is ‘full-fibre’. That means it uses only fibre-optic cables, that is not mixed with slower copper wiring, to deliver a broadband connection right into your home, and not via a green street cabinet.
No national ISPs sell full-fibre or FTTP broadband to and that’s why you won’t see it on any price comparison websites. You can still buy it, but it is usually extremely expensive compared to FTTC fibre broadband due to its rarity.