So basically, the fatty acids give the phospholipids, the hydrophobic non polar properties. But it's these two groups, the phosphate and the alcohol, that give them the water loving hydrophilic polar quantities and so qualities. And so that's exactly why we call phospholipids amphipathic, because they have groups that can associate with polar and non polar environments. So let's begin with phosphoglycerides. And this is basically a diagram that describes what a phosphoglyceride actually looks like. So by definition, when a phospholipid contains a glycerol as the platform molecule, we call such a phospholipid phosphoglyceride.