👉 A guarantee is a promise made by one party to another that they will perform a certain action or fulfill a certain obligation under a specific condition. In other words, it is an assurance provided by a third party to a buyer that the seller will deliver goods or services as agreed upon. The term "guaranteeship" is often used in legal contexts to describe a situation where a seller promises to perform a specific action or fulfill a certain obligation under a condition that is not specified in the contract