What is Asin in Amazon? is a question that refers to the Amazon Standard Identification Number, which is a unique combination of characters (numbers, letters, or a combination of both) that is assigned to a product by Amazon.com and its partners. This identification number, also known as an ASIN, serves as a way for sellers and customers to easily find a specific product within Amazon's massive product catalog. It is important to note that an ASIN is unique only within the same marketplace, meaning that different Amazon sites (such as the US and Germany) may use different ASINs for the same product. However, in general, there can never be two items with the same ASIN.