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Iced tea is a form of cold tea. Though it is usually served in a glass with ice, it can refer to any tea that has been chilled or cooled. It may be sweetened with sugar or syrup, or remain unsweetened. Iced tea is also a popular packaged drink, normally mixed with fruit-flavored syrup such as lemon, raspberry, lime, passion fruit, peach, orange, strawberry,blueberry, mango, and cherry. While most iced teas get their flavor from tea leaves (Camellia sinensis), herbal teas are sometimes served cold and referred under the same categorical name. Sun tea is made by a particularly long steeping of tea leaves at a lower temperature (one hour in the sun, versus five minutes at 80 to 100 °C (176 to 212 °F). In Canada "iced tea" commonly refers to a presweetened tea drink similar to "sweet tea" in the southern United States. The variety most broadly available is sweetened with lemon juice. Because of a large Chinese and especially Hong Kong diaspora, Hong Kong style "lemon tea"(香港凍檸茶) is commonly also available as well as milk tea and Yuenyeung(鴛鴦).[citation needed]

Source: Wikipedia