In the narrow sense, tea is a drink made from a plant called the Chinese "tsa". This plant is called Camellia sinensis (Latin), and, depending on the degree of oxidation, tea leaves can be white, green, oolong and black. Tea is categorized based on the degree of oxidation (fermentation) who remain in the leaves.
Tea leaves, if they are not collected as soon as they run dry, blast quickly and begin to acetify. Starch is turned into sugars, the leaves are progressively are blackening as clorofila are down and are released tannins. To stop these processes, we will remove water from the leaves through heating. Procedures used for tea preparation are: tea oxidation, heating, drying and adding other plants, spices or fruit.

In the broad sense, the "tea" refers to tea infusions of plants, flowers, fruits, with the therapeutic properties.
After water is boiled, is take out from fire and Poup over plants that have placed in advance in a glass vase, or other non-metallic vessel.
If the plants are fresh, they are left in the vase about 30 seconds. Tea must have a light color. Dried plants let them stay more in the vessel, about 1 or 2 minutes. Roots are put into cold water, and let them boil with bubble. Usually put a little spoon with chopped plants at 200-250 ml of water (about a cup of tea). Leaves contain numerous esences benefic for body
For example, green plant (leaf) contains polyphenol, methyl-xantina, cofeina, amino acids, etc.. Green Tea for example, is useful for burning fat by speeding up metabolism, so that calories will not have time to store. Tea black can be used in preventing heart disease, cerebral attacks, etc..