What is the concept of studio in foreign student apartments?

STUDIO originally meant: studio, photo studio, studio, studio (for radio or TV programs), studio (for making movies) and studio (for film companies).

But now you can see many STUDIO, mostly an open apartment with bedroom, living room, bathroom and kitchen. It's usually high-end. If it's a student apartment, it's all beds (quite small, but it's also integrated. You have to sit on the bed, it's really not very big. )