# Explain saturated fatty acids.

They possess only single $C - C$ bonds.
A saturated organic molecule is one that has only single carbon-carbon bonds. Some examples include alkanes, which have a chemical formula of ${C}_{n} {H}_{2 n + 2} , n \in \mathbb{N}$.
An unsaturated organic molecule is one that has no single carbon-carbon bonds, that means it can potentially have double or triple $C - C$ bonds. Some are called, alkenes, with a chemical formula of ${C}_{n} {H}_{2 n} , n \in \mathbb{N}$, and some are alkynes, with a chemical formula of ${C}_{n} {H}_{2 n - 2} , n \in \mathbb{N}$. Both can be distinguished by a simple test of using bromine water, where alkenes decolorise the water, while alkanes have no effect.
So saturated fatty acids are those that contain all, single $C - C$ bonds, but can still contain double bonds with other atoms, such as the $C = O$ bond.