Two Pesos, Inc. v. Taco Cabana, Inc. is a landmark case in trademark law that dealt with trade dress protection and the concept of acquired distinctiveness. The case established that trade dress, which refers to the visual appearance of a product or its packaging, can be protected under trademark law even if it has not acquired secondary meaning, provided it is inherently distinctive. This case emphasizes the importance of distinctiveness in trade dress protection and the legal recognition of nontraditional trademarks.