Lots correspond to a certain number of products you received and store altogether in one single pack.
Serial numbers are identification numbers given to one product in particular, to allow to track the history of the item from reception to delivery and after-sales.
Lots are interesting for products you receive in great quantity and for which a lot number can help in reportings, quality controls, or any other info. Lots will help identify a number of pieces having for instance a production fault. It can be useful for a batch production of clothes or food.
Serial numbers are interesting for items that could require after-sales service, such as smartphones, laptops, fridges, and any electronic devices. You could use the manufacturer’s serial number or your own, depending on the way you manage these products
消耗品例如厨房用纸, 厕所用纸, 笔或者手写纸等使用批次是没有意义的, 因为这些产品你从来不会退货。
另一方面, 只有那些使用质保期现／或者售后服务的产品使用单个产品的序列号, 除了这些, 给产品分配序列号是浪费时间的行为。例如给一块面包分配一个序列号是没有一点意义的。