The higher monocarboxylic acids containing carbon-carbon single bond are called Saturated fats. It has the maximum possible number of hydrogens attached. Each carbon atom has two hydrogen atoms attached to it.
Solid fats are saturated
Examples: Stearic acid, Palmitic acid
The higher monocarboxylic acids containing carbon-carbon multiple bonds are called unsaturated fats. They contain carbon atoms which are not fully saturated with hydrogen. These carbon atoms are linked together by double bonds.
Oils are unsaturated.
Examples: Oleic acid, Linoleic acid.