The iconic M&M's slogan, "melts in your mouth, not in your hand," was first introduced in 1954 and highlights the candy's unique design. M&M's were created during World War II as a solution to soldiers' complaints about chocolate melting in their pockets. The candy's hard sugar shell, which encases its chocolate center, prevents them from melting easily, making them perfect for warm climates. This innovative feature and clever marketing have made M&M's a global favorite, with billions of candies produced each year and a variety of flavors and colors available worldwide.