The horizontal doors used on closet sliding doors move along a track mounted overhead and a floor guide for stability. To manage the smooth movement they‘ll have cushions and buffers on the ends to prevent damaging adjacent construction to ensure a smooth gliding motion when operated. Closet sliding doors of the vertical variety are seated in a groove, much like dresser drawers to ensure they glide in one direction.
When you are looking at the front door designs keep in mind the rest of your house. If you have a specific style throughout the house you should try to have the front door design match. It would detract from the style that you have already worked so hard to create in your home if you choose a door that clashes with this style.
The Japanese may actually be the first people to use what we refer to today as sliding closet doors. These doors essentially follow the commonly accepted definition of a door that moves sideways or in an up and down motion. They still serve the same purpose as they did then, to manage space, provide ease of use and highlight or disguise internal or external features of a structure.