According to Wikipedia: “Shower doors are doors used in bathrooms that help keep water inside a shower or bathtub and are alternatives to shower curtains. They are available in many different styles such as framed or frameless, sliding or swing. They are usually constructed of aluminium, clear glass, plexi-glass or tempered glass. Shower doors can come in many different hardware finishes and glass patterns that can match other bathroom hardware such as faucets and shower heads. There are also shower doors that are in a neo angle design for use on shower pans that have the neo design as well. The design of the shower pan is extremely important as the shower door must be the type required for the pan in order to work. A shower door requires plastic lining along the edges of the door to protect against water leaking out.”