I am not certain that I am naming this type of door correctly as a
pocket door.
It slides on rails that are located within the wall structure, rather
than having hinges. Is this the correct name ?

I need to research the installation requirements, such as how much
wall space does this door require ?

Are Pocket Doors available from Home Depot? I've not seen any there.

Where is this type of door sold?

Vince
Long Island, NY