oleic acid
It is an unsaturated fatty acid because is has a double bond between the carbon atoms and it also makes it have a kink in it's chain
Palmetic acid CH3-(CH2)14-COOH is a common example of saturated fatty acid.
Unsaturated fatty acids are fatty acids that have double bonds in their long carbon chains.
Lard is a mixture of fats (= triglycerides, not fatty acids) of which 55% is unsaturated.