These are 'good' fats. They are called unsaturated because they have one or more open spots on their carbon skeletons. This category of fats includes the essential fatty acids linoleic and linolenic. The main sources of these fats are from plant foods, such as safflower, sunflower, arid flaxseed oils.
fats containing fatty acids with some carbon-carbon double bonds. Saturated fats have all possible positions that could be occupied by a hydrogen atom filled, leaving no double bonds in the carbon chain.