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Postmarks refer to the cancellations applied by postal authorities on mailed items such as letters, postcards, and packages to indicate that they have been processed and are ready for delivery. These markings often include the date, time, location, and other relevant information about the mailing. Postmarks can be categorized as either regular or special, with regular marks being applied daily and special ones being used for specific events, holidays, or commemorations. Collectors of postmarks, known as postmark collectors or postal historians, often seek out examples from different time periods, locations, and designs to build their collections. Some may focus on a particular theme, such as transportation, architecture, or historical figures, while others may simply enjoy the aesthetics of the markings themselves. Regardless of the approach, collecting postmarks can be a rewarding hobby that offers insights into the history of mail service and communication.