A Veranda and Terrace Canopy are two words implying the same thing; An extension to a house covering an outside area. Or a roof supported by two posts, made of aluminium with a polycarbonate roofing.
A glass room refers to an 'uninsulated' house extension in the shape of a terrace canopy or veranda equipped with (glass) (sliding) doors so that the area can be fully closed. Architecturally, a glass room is not part of the house.
A glass room looks like a conservatory, but the main differences is that a conservatory refers to an insulated extension of the house. So this is an actual part of a house, making it more expensive and complicated to buy and install a conservatory.
Finesse Windows are able to supply terrace canopies, verandas and garden rooms.