What is smoothie?

A smoothie is a blended, chilled, sweet beverage made from fresh fruit. In addition to fruit, many smoothies include crushed ice, frozen fruit, or frozen yogurt.

They have a milkshake-like consistency which is thicker than slush drinks.

Unlike milkshakes, they do not usually contain ice cream, but can contain milk.

Smoothies are marketed to health-conscious people, and some restaurants offer add-ins such as soy milk, whey powder, green tea, herbal supplements, or nutritional supplement mixes.

Smoothies became available in the United States in the late 1960s when ice cream vendors and health food stores began selling them.

By the 1990s and 2000s, smoothies became available at mainstream cafés and coffee shops, and in pre-bottled versions at supermarkets.

Source: http://en.wikipedia.org/wiki/Smoothie