What does "on the rocks" mean when ordering a drink?

When someone orders a drink "on the rocks," it means that the drink is to be served over ice. The phrase originates from the idea that the ice can resemble stones or "rocks." This method allows for the drink to be chilled while simultaneously diluting it slightly as the ice begins to melt, which can enhance the flavor profile of certain spirits or cocktails.

In contrast, drinks served without ice would be known as neat, while serving a drink with water usually involves adding a splash or a side of water, which is distinct from simply placing ice in the drink. Shaken and strained refers to the preparation method for cocktails that are mixed with ice and then poured into a glass without ice, which is also a different serving technique. Understanding these terms helps bartenders accurately fulfill customer requests and ensures a better drinking experience.