Many NFT series present variations of elements, such as background, accessories, etc. that differentiate one non-fungible token from another of the same series. These variations are called traits. Some traits usually appear less frequently, for example only 1% of the NFTs of the series might have a golden background, making these NFTs rare and therefore more valuable than the 99% others having a black background. The combination of how unique its traits are results in the overall Rarity of each NFT.
Rarity is one of the most key factors in determining the value of an individual non-fungible token. If you want to sell your NFT, you must check the value of such NFT. You can easily determine that an NFT has some rare traits by looking at its properties.