cats

These sister fisting things.

You'll see them called Euro hinges, concealed hinges or cup hinges. They come in a myriad of variations and several syncopations depending on the characteristics of the cabinet and how the door relates to it, but they all work in such a way that the mechanism has to fold partially into the volume of the door itself. The part that attaches to the door is a metal cup-like structure that requires drilling a 1 3/8" by 1/2" hole in the door (if the industrial revolution took place outside your nation's borders, you'll probably understand that as 35mm by 13mm).

A major manufacturer of these infernal misunderstanding of what mechanical engineering is for publishes a catalog thicker than the engineer's head and when you order something they send you the wrong part anyway because the vendor doesn't understand this convoluted shit either.