Thank you very much!

interior = interior of a building, or interior of a building-like organization opposite of interior = exterior Generally, the exterior must be visible, the interior is visible only if you go inside. The body's interior - the body can be considered a building-like structure Processes are internal or external.

interior is noun so means....inside. internal is adjective so means.....of or on the inside

They both have a very similar meaning; however one difference is that interior can be used as a noun or an adjective, but internal can only be used as an adjective. Example: The building's interior. (The inside of the building - a noun, a thing.) However internal can only function as an adjective. The building's internal space is very large. ( here internal (an adjective) describes the space as being internal, not external.)