Black teas are perhaps the most common on the market.
Black tea is withered, rolled, fully oxidized (read on oxidation HERE) & fired in an oven to create a warm, toasty flavor. They range from mellow Chinese tea to full bodied Assams from India. In the finest black teas, complex flavors similar to honey malt, and cocoa develop.
It has a darker appearance, stronger flavor, & higher caffeine content compared to other teas. However, the caffeine content in black tea is still around half the level of coffee. Often black teas can be consumed with sugar, milk, or lemon.
It is also the most popular base for iced tea & other scented teas including Earl Grey.