A warranty is a promise about a product that the law will enforce, and most disputes turn on a promise nobody read carefully. This article explains the difference between express warranties, implied warranties that arise automatically, and service contracts sold separately at the register. It covers the federal statute that governs consumer product warranties, including the full and limited designations, the pre-sale availability rule, the prohibition on disclaiming implied warranties when a written warranty is given, and the fee-shifting provision that makes small claims worth bringing. It explains how disclaimers and remedy limitations work, when they fail, and why "as is" does not mean what sellers think. Examples follow a refrigerator, a laptop, and a used car through claim, denial, and escalation. Readers finish knowing what to send, when a denial is unlawful, and what a claim is actually worth.