A fun way to make iced tea is something I learned as a kid called "sun tea". My mother would put tea bags and cold water in a glass container and set it out in the sun. An hour or two later, she would take the bags out and refrigerate it. I am not sure if the sun did anything special, but it always tasted very refreshing, mellow and smooth, like a summer afternoon. Sweetener is optional, but not preferred.
Iced tea (sometimes corrupted to ice tea) is a form of cold tea, often served in a glass with ice. It may or may not be sweetened. Iced tea is also a popular packaged drink. It can be mixed with flavored syrup, with common flavors including lemon, peach, raspberry, lime, and cherry. While most iced teas get their flavor from tea leaves(Camellia sinensis) , other herb-infused beverages are also sometimes served cold and referred to as iced tea. Unsweetened iced tea is sometimes made by a particularly long steeping of tea leaves at lower temperature (one hour in the sun versus 5 minutes at 80-100°C). Some people call this "sun tea". In addition, sometimes it is also left to stand overnight in the refrigerator.