1. From the perspective of goods, SKU refers to a single product whose attributes have been determined. As long as the attributes of the goods are different, they are different SKUs

2. From the perspective of business management, SKU also contains information about the packaging unit of the goods

3. From the perspective of information system and goods coding, SKU is just a code. Different goods (goods names) have different codes (SKU#). This code is associated one-to-one with the defined goods, so that we can record and analyze inventory and sales according to the data of different SKUs