A phone protector, also known as a phone CASE, is a protective cover for a mobile device. It is designed to protect the phone from scratches, dust, and other damage. The most common type of phone protector is a hard plastic or rubber CASE that fits snugly around the phone. Some cases also offer additional features such as shock absorption, water resistance, and anti-glare protection. Cases come in a variety of colors, styles, and materials, allowing users to customize their phone's look and feel.