Sliding doors are a highly-practical design feature as they move from side to side, and there is no need to have to leave space for a door to swing open. This space-saving feature makes them ideal for areas where building space is limited, and floor plans need to optimise every inch of space. This aspect is part of why so many homes feature a sliding door in Singapore.
They are also versatile, as the material used to build the door can lend to different utilizations. For example, if you have a balcony, and want to let some extra light, you might opt for a glass door. Whereas inside, a light-weight solid material can be used to provide privacy.