The common meaning of it is the person who loves anime culture excessively and sits in front of the anime episodes at night and the ends of the day without even fidgeting, and his room is full of anime character posters and their small figures. But the word otaku is called any person who has an obsession with a particular thing, and it does not have to be of Japanese origin. If you love video games and spend all your money on them and on their gaming platforms, then you are an otaku for this thing.