who is a Veterinary physician
A veterinary physician, also known as a vet, is someone who practices medicine on animals.
what else is their function
Well veterinary medicine diagnos and treat diseases of animals.  They also treat injuries
is it injuries of animals?
Yes, most vet are in a general practice.  However some vets are more specialized in a certain group of animals
are their different specialities in veterinary medicine  
Yes, and vets need to undergo veterinary education and get a degree
that means for someone to become a veterinary physician he need a degree program
Yes, vet medicine can be practiced with or without professional supervision