Anion exchange resins are materials used in water treatment and chemical processes to remove negatively charged ions, known as anions, from solutions. These resins contain positively charged sites that attract and hold anions, allowing for their separation from other components in the mixture. Common applications include purifying drinking water and treating wastewater. These resins are typically made from organic polymers and can be found in various forms, such as beads or granules. They are often used in conjunction with cation exchange resins, which target positively charged ions, to achieve comprehensive ion removal in ion exchange processes.