Party A takes a fancy to Party B's production capacity and allows Party B to produce products designed by Party A and use Party A's trademark. For Party B, this is called OEM; ; Party A's technology and design are favored by Party B, and Party B introduces production and labels it with Party B. For Party A, this is called ODM；; A creates its own brand A, and B produces and sells the products of brand A. First of all, it is called OBM.
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The word OEM is too common in computer hardware products, such as OEM CD-ROM, OEM monitor and OEM mouse. Some people even think that it is a brand with quality assurance.
In fact, OEM has a close relationship with modern industrial society. Some famous brand manufacturers often turn to other manufacturers for help because their factories can't meet the requirements of mass production, or they need some parts. These help manufacturers are called original equipment manufacturers. If IT is extended to the IT field, it refers to those manufacturers who do OEM work. For example, CPU fans are not produced by Intel or AMD, and they are generally produced by professional motor manufacturers such as Sanyo Company of Japan.