In the theatre of Ancient Greece and classical drama, the skene was the structure at the back of a stage. The word skene means “tent” or “hut”, and it is thought that the original structure for these purposes was a tent or light building of wood and was a temporary structure. It was initially a very light structure or just cloth hanging from a rope, but over the course of time the skene underwent fundamental changes. First it became a permanent building, whose roof could sometimes be used to make speeches, and as time passed it was raised up from the level of the orchestra, creating a proskenion, or “space in front of the skene”. The facade of the proskenion was behind the orchestra and provided a space for supporting stage scenery. During the Roman Period the skene had become a large and complex, elaborately decorated, stone building on several levels. Actors emerged from the skene and could use its steps and balconies to speak from. It was also where costumes were stored and to which the periaktoi (painted panels serving as the background) were connected.
Source: Skene (theatre) – Wikipedia