What are the key differences between definitive and commemorative stamps, and how are they used in postal services?
**History of Stamps**?
What are the differences between commemorative and definitive stamps, and how are each used by postal services?
How do different countries design and issue their stamps, and what are some notable themes or subjects that have been featured?
What are some of the most famous or valuable stamps in the world, and what makes them unique?
How do collectors categorize and evaluate the value of stamps, and what factors contribute to a stamp's rarity and worth?
What are the origins and history of postal stamps, and how have they evolved over time?
How has the role and significance of stamps changed with the advent of digital communication and electronic mailing systems?
What security features are included in modern postage stamps to prevent counterfeiting?
How do differences in stamp designs and features reflect a country's cultural or historical heritage?
