Final is what the client gets after approving the draft. It is the final 3D visualization with all the necessary parts including proper post-production or any other 2D work that needs to be done to the image (e.g. adding people, fire, smoke, godrays, lens flare, pets etc.).

Default size is 4K (4000px on the longer side) unless it has been agreed upon otherwise initially (e.g. the client requests 8K right at the beginning of the project).