A functional trademark is a trademark that serves a utilitarian purpose rather than a distinguishing one, meaning it is primarily functional and cannot be protected under trademark law. This type of trademark often describes a product's shape, design, or features that are essential for its use, which leads to the conclusion that the design is necessary for the product's function rather than serving as an identifier of source. As such, the functionality doctrine prevents trademarks from monopolizing useful product features that competitors also need to make and sell their goods.
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