The word guarantee just refers to a promise that certain conditions will be fulfilled. We can use it with products, or with things that are not products:
All our products come with a 30-day money-back guarantee.
I guarantee you will enjoy the experience.
We guarantee the accuracy of the information in our reports.
A warranty is a specific type of guarantee - it is ONLY used for products, and it is a promise that if the product breaks, the seller or manufacturer will fix it or replace the product.
Fact
The first tattoo machine was invented by Samuel O'Reilly. He did this by using equipment that Thomas Edison used to engrave hard surfaces. .. More >>