Milkshake is a sweet cold beverage
I love milkshakes! What are they usually made of?
Milkshake
A milkshake is a sweet, cold beverage that is usually made from milk, ice cream, and/or ice milk, and sometimes flavorings or sweeteners such as butterscotch, caramel sauce, chocolate syrup, or fruit syrup.
Many more precise and rigid definitions are used, subject to region. Outside of the United States, a milkshake that uses ice cream or ice milk is sometimes called a thick milkshake or thick shake; in New England, the term frappe may be used to differentiate it from thinner forms of flavored
This allows a greater variety than is available in machine-made shakes. Some unusual milkshake recipes exclude ice cream. 
Milkshake-like recipes which use a high proportion of fruit and no ice cream are usually called smoothies, even if frozen yogurt (a dairy dessert) is used; however there are cases where a blended beverage is made with sherbet, frozen yogurt and fruit which are sold as smoothies even though they could also be considered milkshakes. When malted milk is added, a milkshake is called a malted milkshake,