Olive oil is a liquid fat obtained from olives (the fruit of Olea europaea; family Oleaceae), a traditional tree crop of the Mediterranean Basin. The oil is produced by pressing whole olives. It is commonly used in cooking, whether for frying or as a salad dressing.
How it is made – Canola oil. There are several processing and chemical steps to making refined canola oil
Canola may refer to an edible and industrial oil (also known as canola oil) produced from the seed of any of several cultivars of rapeseed bred to be low in erucic acid from the Brassicaceae family of plants, or to the plants themselves, namely cultivars of Brassica napus L., Brassica rapa subsp. oleifera, syn. B. campestris L. or Brassica juncea.