The compositon of oil

Oil is mixture of triglyceride molecules

will be confusing for non-chemistry

Triglyceride molecule = 1 glycerol + 3 Fatty acids combined chemically together

There are many types of fatty acids and characterized by their number of carbon atoms, and always in even number - from 6 - 24

common fatty acid
C12 - Lauric acid (found in coconut/palm kernel oil)
C16 - Palmitic (found in palm oil)

these are call saturated fatty acid

When carbon number getting bigger, there will be unsaturation or presence of double bind

common unsaturated fatty acid
C18.1 Oleic acid (found in Olive Oil)
C18.2 Linoleic acid (Soyabean Oil)
C18.3 Linolenic acid (Linseed Oil)
C22.1 Euricic (Rapedseed Oil)

The characteristic of the oil is determined by the carbon number and the unsaturation

So if you analysis palm oil, typical composition

C12 - 0.4%
C16 - 42%
c18.1 - 38%
others - C14, C18, C18.2 etc