An office stamp is a tool used to imprint a custom message, logo, or design onto documents for consistent, efficient, and professional marking. They consist of a rubber or polymer stamping surface, often with a handle or a self-inking mechanism, and are used for tasks like dating, addressing, approving documents, or adding company information. Common types include self-inking, pre-inked, and wood-handle stamps, which can be customized to fit a variety of business needs.