Distilled water is a type of pure water produced through a distillation process. It is the most common type of purified water, and it is used in various laboratory and medical applications. However, there are several synonyms used for the term distilled water, such as deionized water, demineralized water, and purified water. Deionized water is a water type that has been stripped of its ions using an ion exchange process, while demineralized water has had its minerals removed through an ion exchange process or membrane filtration. Purified water, on the other hand, refers to any type of water that has been purified through various treatment processes, including distillation, reverse osmosis, and ion exchange.