Grape, a juicy fruit found in variety of colors. Grape is used for eating, wine making and as a dry fruit. It is also used in jelly, vinegar, candy, seed extraction, seed oil and jam. Vitis vinifera and vitis labrusca regions act as the origin for the grapes. Wine making became the main reason for cultivating grapes. The major grape producing countries in the world are South America, Austria, Mexico and eastern countries. Thousands of grape varieties are grown all over the world; the wine grape varieties represent only a fraction of them. The color, size, phenolic distribution and acidity of grapes give each wine its own characteristic.
More than 10,000 grape varieties exist, but only few are used for commercial purpose. For raisin production only three varieties are used and as table grapes less than one dozen are consumed. In wine production approximately 130 varieties are used. Chardonnay, merlot and cabernet sauvignon grape varieties are used by the wine experts since they think that the wine drinker's focus their attention only on that and other varieties are not known.
Wine quality is affected by the factors such as soil, climate, viticulture and wine making techniques. When the grape variety is well suited to the soil and climatic structure the quality of wine is maximized. Wine types with distinct flavor are produced by many native grape varieties.
White and red grapes are the major grape varieties. Varietal wines are wines that are made from single grape breed. But many wines combine numerous grape varieties. Chardonnay and cabernet sauvignon act as international varieties and are grown globally.
To give different taste and color each type of wine uses different grape variety. Attributes such as color, size, skin thickness and acidity differ in all kinds of grapes. These attributes are influenced by the area in which the grapes are cultivated. To manufacture a high quality wine, a qualified winemaker knows how to merge and choose the grapes from many varieties. 
The Wine grapes categories are:
Red grapes
During the month of august to November the red grapes grow in plenty. These grapes are rich in vitamin c and have a sweet pulp. Pinot noir, syrah, nebbiolo and zinfandel are some of famous red grapes...more about red grapes
White Grapes
Grapes that are green, yellow, pink or brown in color are called white grapes. The world's famous white wine is the chardonnay, because of its gamut flavors and styles... more about white grapes
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