Sliding door

A sliding door is a door that opens horizontally, by sliding. Very often, such doors slide along a wall. Sliding doors are commonly used, for example in the bathroom, to separate the shower. They are also used for closets.

• 
  Tracks for a sliding door at a shop entrance, in Pompeii, 1st century AD
• 
  Some sliding doors are run on a rail, like this one
• 
  A modern wardrobe, with sliding doors
• 
  Automatic sliding door, in Hong Kong