An extended warranty, sometimes called a service agreement, a service contract, or a maintenance agreement, is a prolonged warranty offered to consumers in addition to the standard warranty on new items. The extended warranty may be offered by the warranty administrator, the retailer or the manufacturer. An extended warranty is actually an insurance policy on your vehicle, a safeguard against expensive, unforeseen repairs. It covers repairs for an agreed-upon period of time and miles. ... An extended warranty can help make sure you don't have to pay through the nose for unexpected repairs.