A revenue stamp is a type of adhesive label used to indicate that a fee or tax has been paid on a specific document or transaction. These stamps are often affixed to legal documents, contracts, or financial instruments to show compliance with government regulations. They serve as proof that the required payment has been made, helping to prevent fraud and ensure proper record-keeping. Revenue stamps can vary in design, denomination, and purpose, depending on the laws of a particular country or region. They are commonly associated with various forms of taxation, such as property tax, sales tax, or excise tax. Collectors often seek out rare or historical revenue stamps, making them a niche area of philately.