The way a product looks can be claimed under two very different bodies of law, and they run in nearly opposite directions. A design patent is a fast, examination-based grant that hands the owner a fifteen-year monopoly on an ornamental appearance the day it issues, with no proof of brand recognition required. Trade dress is a slow-building trademark right, earned in the marketplace once consumers read a look as a signal of source, that can last as long as the look keeps identifying the maker. This guide compares the two regimes point by point—subject matter, origin, term, the functionality bar, infringement proof, remedies, cost, and deadlines—and shows why sophisticated companies treat them as relay runners rather than rivals, filing the patent to cover a product's early years and cultivating trade dress to carry protection forward. Landmark authority anchors every section, from Wal-Mart v. Samara and TrafFix to Egyptian Goddess and Samsung v. Apple, and a running hypothetical about a fictional drink-tumbler startup keeps the doctrine concrete.