Such doors are called pocket door doors.

Appearance and materials — this is by no means all that is worth remembering when choosing interior doors. There are also different types on the principle of opening. The most common option is a standard swing door that opens up to the right, however, if you do not want to be content with classics (or when space requires a different approach), you can turn to other types of interior doors. For example, there is a sliding door. It is attached to the rails under the ceiling and works on the principle of the cabinet door. For this option, space is required, however, this type can also be attributed to the doors-racks, which simply turn into an accordion. Sometimes the rail for moving the door is attached in the doorway and pulled into the space cut into the wall, and the door leaf can be moved into the same space, that is, in the open state, the door is completely hidden in the wall. Such doors are called pocket door doors. In the room they look very stylish, in addition, in the open state, the feeling is created that the opening is free and this increases the space visually.