FTTC, being the most commonly used fibre connection, uses a providers existing cabinet connections to bring broadband into your premises. The fibre optic cable terminates at the cabinet, where it is replaced by traditional copper line. Generally the least expensive connection, speeds are the lowest of the 3.
FTTP, Uses the same technology as FTTC, but crucially, the fibre optic cable runs both to, and from, the cabinet. Despite there still being a shared infrastructure, FTTP offer greater speeds than the aforementioned.
Leased line, also referred to as a fibre leased line, is a dedicated fibre optic service from the provider, directly to your premises. Unlike FTTP, a leased line connects directly to the public internet over a dedicated fibre optic cable; as there’s no sharing of infrastructure, leased lines provide the fastest available upload & download speeds.