Decimal stamps refer to postage stamps denominated in decimal currency units, as opposed to the traditional non-decimal currency units such as pence and shillings. Decimalization is the process of changing a currency system from non-decimal to decimal, where units are based on powers of 10. This typically involves converting currency units such as pence, shillings, or cents into units based on multiples of 10, such as dollars, euros, or cents. Decimal stamps are designed to reflect this change in currency system, featuring values in the new decimal units. For example, instead of a stamp being denominated as "3 shillings and 6 pence", it might be denominated as "35 new pence" after decimalization.