Can someone please explain why there is a distinction between Anime and TV Shows? Its my understanding that Anime are either in a Movie Format (Standalone) or in a TV Format (Series).
They're probably just making it clear that they'll populate their database with information for anime as well as for western TV shows. There's a very smooth distribution system for fan-translated anime so many people watch a lot of anime before it has aired outside Japan, and would want a database that keeps track of such viewing.
but isnt that just a categorisation like Crime, Drama, Comedy? Anf if not: how are other (non japanese) animated movies/series (justice league etc) treated?
Anime has it's own categories like Angst
Ecchi
Battle Royale
edit
Bullet Time
Calling Your Attacks
Collateral Damage
Gunfights and a lot more. There are multiple websites that only feature Anime, and zero websites with full content about all three TV, Anime, Movies