A salt rim is a common garnish used for cocktails, particularly for drinks like the Margarita. It involves coating the edge of a glass with salt, enhancing the drink's flavor and providing a contrasting texture. The process typically starts by moistening the rim with lime juice or water, followed by dipping it into a plate of salt. This technique not only adds a savory element to the drink but also creates an appealing visual effect. The salt rim can be customized with different types of salt, such as kosher salt or flavored salts, to complement various cocktail recipes.