So, in this lecture, I'd like to discuss what fatty acids are and what the cells of our body actually use fatty acids for. And I'd also like to introduce the processes of fatty acid breakdown in fatty acid synthesis. So what are fatty acids? Well, fatty acids are these biological molecules that consist of a long hydrocarbon chain and a terminal carboxylate group. Now, the terminal carboxylate group gives the molecule hydrophilic polar properties, while the long hydrocarbon chain gives the fatty acids hydrophobic nonpolar properties. So what do our cells use fatty acids for?