Deionization is a water purification process that removes ions, which are charged particles, from water. This is typically achieved using ion exchange resins that attract and replace unwanted ions, such as calcium, magnesium, and sodium, with hydrogen and hydroxide ions. The result is highly purified water, often referred to as deionized water. Deionized water is commonly used in laboratories, industrial applications, and electronics manufacturing, where impurities can interfere with processes or products. It is important to note that while deionization removes ions, it does not eliminate all contaminants, such as bacteria or organic compounds, which may require additional purification methods.