A rain jacket is a lightweight, waterproof outer garment designed to protect the wearer from rain and wind. Typically made from materials like nylon or polyester, these jackets often feature sealed seams and water-resistant zippers to keep moisture out. They are popular for outdoor activities such as hiking, camping, and commuting in wet weather. Many rain jackets also include features like adjustable hoods, ventilation openings, and pockets for convenience. Some models are designed to be packable, allowing them to be easily stored in a backpack or bag when not in use. Overall, a rain jacket is an essential item for staying dry during inclement weather.