Oregano is an important culinary herb, used for the flavor of its leaves, which can be more flavorful when dried than fresh. It has an aromatic, warm and slightly bitter taste, which can vary in intensity. Factors such as climate, seasons and soil composition may affect the aromatic oils present, and this effect may be greater than the differences between the various species of plants.
Oregano’s most prominent modern use is as the staple herb of Italian-American cuisine. It is most frequently used with roasted, fried or grilled vegetables, meat and fish. Unlike most Italian herbs, oregano combines well with spicy foods, which are popular in southern Italy.
Hippocrates used oregano as an antiseptic, as well as a cure for stomach and respiratory ailments. Oregano is high in antioxidant activity. (From Wikipedia) Oregano is also used in tea for indigestion.
In India Greek oregano is preferred for its heavy oregano aroma and considered great for pizza and Italian cooking.