Accessory
Definition 1 of 3
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Enhancement Purpose
Accessory is used to describe items that improve the functionality or appearance of the main product. Smartphone cases are popular accessories for personalization.
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Not Essential
While accessories add value, they are not absolutely necessary for the functioning of the primary item. You can ride the bike without its accessory basket.
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Broad Usage
This term is versatile and can apply to various items from electronics to fashion. A tie is considered a fashion accessory.