1. A trademark is not necessarily a brand. Only when a trademark has a certain degree of popularity and reputation can it become a famous brand.

2. Normally, a brand must be a registered trademark. However, there have been exceptions in recent years. For example, although Mengniu's sour yogurt has not been registered, it has been recognized as a well-known trademark for the first time, which is of course a brand.

3. Barcodes are different from the previous two. In retail business, barcodes have good functions in settlement and ordering, shortening customer waiting time, accelerating services, inventory inventory, and improving management efficiency. The use of this technology is conducive to the development of international trade and the realization of modern management.