OBM is the original brand manufacturer, ODM means original design manufacturer, and OEM means original equipment manufacturer.
The difference between OEM and ODM is that OEM products are customized for brand companies. After production, only the name of the brand can be used, and the name of the manufacturer cannot be used for production.
The ODM depends on whether the brand company has bought out the copyright of the product. If not, the manufacturer has the right to organize production himself.