Vegetable fats and oils are substances derived from plants that are composed of triglycerides. Nominally, oils are liquid at room temperature, and fats are solid; a dense brittle fat is called a wax. Although many different parts of plants may yield oil, in actual commercial practice oil is extracted primarily from the seeds of oilseed plants.The temperature-based distinction between oils and fats is imprecise, since definitions of room temperature vary, and typically any one substance has a melting range instead of a single melting point.Triglyceride vegetable fats and oils include not only edible, but also inedible vegetable fats and oils such as processed linseed oil, tung oil, and castor oil, used in lubricants, paints, cosmetics, pharmaceuticals, and other industrial purposes. Although thought of as esters of glycerin and a varying blend of fatty acids, in fact these oils contain free fatty acids and diglycerides as well.

Indian Cooking is known for its use of spices, herbs and flavorings. The common ingredients in Indian Cuisine are rice or bread (rotis), a variety of dals (lentils), regional vegetables, pickles, ghee, chutneys, a meat or fish dish. Spices are an essential element to Indian cuisine. The cooking medium is generally oil. The type of oil used differs

Indian Cooking is known for its use of spices, herbs and flavorings. The common ingredients in Indian Cuisine are rice or bread (rotis), a variety of dals (lentils), regional vegetables, pickles, ghee, chutneys, a meat or fish dish. Spices are an essential element to Indian cuisine. The cooking medium is generally oil. The type of oil used differs

Major manufacturers have even "offed" the off flavors using a deodorizing process similar to that in oil refining, which involves passing cooked soymilk through a vacuum pan at extremely high temperatures in the presence of a strong vacuum. (there's much more in the article)

Plenus Co., Ltd., which operates Japan’s nationwide take-out bento chain Hokka Hokka Tei (a.k.a. Hokka Hokka Bento, or Hokka-ben) and Yayoiken restaurants, has unveiled plans to begin recycling the used cooking oil from its 2,400 branches into fuel for its delivery vehicles.