Hydrophilic polymers are materials that have a strong affinity for water, meaning they can easily absorb and retain moisture. These polymers contain polar groups that interact with water molecules, allowing them to swell and form gels. Common examples include polyvinyl alcohol and hydroxyethyl methacrylate, which are used in various applications such as medical devices and personal care products. Due to their water-attracting properties, hydrophilic polymers are often utilized in fields like biotechnology and pharmaceuticals. They can enhance drug delivery systems by controlling the release of medications and improving the solubility of poorly soluble drugs. Their ability to maintain moisture also makes them valuable in cosmetics and skin care formulations.