In the context of NFTs and digital collectibles, rarity indicates how unique an item is compared to others in the same category. Items that are rarer often have a higher perceived value among collectors, as they are less available in the market. Rarity can be quantified through various measures, such as the number of copies produced, the distinct attributes an item has, or the history of an item's ownership and sale. This concept is essential in game economics, digital art, and other digital ownership applications where uniqueness can drive demand and pricing.