Revenue stamps are adhesive labels used to indicate the payment of taxes or fees on certain documents and transactions. They serve as proof that the required payment has been made, often for legal documents, licenses, or other official papers. These stamps can vary in design, value, and purpose, depending on the jurisdiction and the specific tax or fee being collected. Historically, revenue stamps have been used in many countries, including the United States and United Kingdom, to help governments collect revenue. They are typically affixed to documents and canceled to prevent reuse. Today, digital methods of tax collection are more common, but revenue stamps still hold historical significance and are collected by enthusiasts.