Types of tea used in catering establishments?

There are thousands of different types of tea. There are the true teas made from the Camellia Sinensis plant and there are herbal teas (infusions or tisanes that do not contain the Camellia Sinensis plant).
Tea made from the Camellia Sinensis plant can be divided into five basic categories: black, green, oolong, white, and puer (pu-erh).
Herbal teas are made from herbs, fruits, seeds, or roots steeped in hot water.