What's the difference among endoparasites, ectoparasites, and pathogens?

Question

In regards to ecology

Answer 1

endo-lives within a living host eg. tapeworm

ecto-lives outside host eg. flea

pathogens-causes disease, especially a living microorganism eg. bacterium  

Answer 2

Ectoparasites are parasites which live on the surface of a host and are dependent on at least one gene or its product from that host to complete their own life-cycle.

Endoparasites are parasites which live within the body of a host and are dependent on at least one gene or its product from that host to complete their own life-cycle.

a pathogen  is a biological agent that causes disease or illness to its host.