A lifetime warranty is a guarantee provided by a manufacturer or seller that they will repair, replace or stand behind their product for as long as the original purchaser owns it. This means that if something goes wrong with the item during its entire lifespan, the company will take responsibility and fix the issue at no additional cost to the consumer. The warranty is usually provided in writing and may have specific terms and conditions that must be met for coverage to apply. A lifetime warranty is often seen as a sign of confidence by the manufacturer or seller in their product, and can provide peace of mind to consumers who are making a purchase.