Cabinets are boxes, containers, shelves, etc. used to manage documents and equipment. It is common to have multiple drawers, allowing sorting and separate storage. Each cabinet has different features such as the number, size, and arrangement of drawers. When you insert a header card into the drawer, you can see what is inside, so you don't have to open the contents to check when sorting. Some cabinets have openable doors instead of drawers. Most cabinets are designed to be placed on or around the desk, but some types can be moved on casters. In addition, some drawers are rotatable, and others are locked when one drawer is opened.