What is the use of shot glass?

A shot glass is a small glass typically used to measure and serve distilled spirits or cocktails in a single serving, often around one ounce. It is commonly used in bars and homes for taking shots of liquor, measuring ingredients for cocktails, or serving small portions of liqueurs. Shot glasses often come in various designs and can also be used for ceremonial purposes, such as toasting. Additionally, they can serve as collectible items or souvenirs.