Distilled water, also known as deionized water or demineralized water, is water that has undergone a purification process to remove most, if not all, of its impurities, minerals, and salts. This process typically involves boiling water and then condensing the steam back into water, leaving behind impurities in the form of residue. The result is a highly pure form of water that is free from contaminants.

Distilled water has a wide range of applications across various industries. It is commonly used in laboratories for experiments and analyses that require water with known and consistent purity levels. In the pharmaceutical and healthcare sectors, distilled water is utilized in the preparation of medications and medical devices. It is also a critical component in the manufacturing of cosmetics, toiletries, and personal care products. Additionally, distilled water is used in automotive cooling systems, steam irons, and lead-acid batteries, as it helps prevent mineral buildup and scale formation. While distilled water is highly pure, it is essential to store it in clean and sealed containers to maintain its purity.