Hi hrsanei Here is a definition of warranty: a written guarantee given to the purchaser of a new appliance, automobile, or other item by the manufacturer or dealer, usually specifying that the manufacturer will make any repairs or replace defective parts free of charge for a stated period of time. So you see that a guarantee, like a promise, can be verbal or written, but a warranty is written. Guarantee is often used informally (as a noun or verb); warranty is much more formal.
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