What is a guarantee that something is true called?

A guarantee that something is true is referred to as a warranty. Warranties are formal promises or guarantees regarding the quality or performance of a product or service. In the context of insurance and other contractual agreements, a warranty serves as a binding assurance that specific conditions are met or that certain facts are true. This legal commitment can have significant implications for the parties involved—particularly if the warranty is found to be false or if the conditions outlined are not fulfilled, leading to potential legal consequences or claims denials.

In this context, while terms like declaration, assertion, and affirmation may also indicate claims of truth or validation, they do not carry the same legal weight or binding nature as a warranty does. A warranty typically implies a deeper obligation to rectify or remedy if the guaranteed conditions are not satisfied, making it a crucial component in contracts, especially in the field of insurance.