A rocks glass, also known as an old-fashioned glass or lowball glass, is a short, wide glass typically used for serving spirits, cocktails, or mixed drinks. It usually holds between 6 to 10 ounces and has a sturdy base, making it ideal for drinks served with ice, such as whiskey or cocktails like the Old Fashioned. The design of a rocks glass allows for easy mixing and sipping, enhancing the drinking experience. Its versatility makes it popular in bars and homes alike, as it can be used for both casual and formal occasions. The glass is often associated with classic cocktails and is a staple in any barware collection.