What is a promise,written or unwritten,that a product will do certain things or meet certain standards?

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A warranty is a promise, either written or unwritten, that a product will do certain things or meet certain standards. Trademark refers to the symbol or logo that identifies a particular brand, copyright refers to the legal ownership of a creative work, and a label simply provides information about the contents of a product.

What Is a Promise,written or Unwritten,that a Product Will Do