This graph shows the comparism between the popularity between Macs, Macbooks, PCs, and Chromebooks. PC is more popular than all of those combined probably because they are less expensive and they are made by many companies like HP, Acer, Lenovo, Dell, and many that make the vast majority of Windows PCs in the world. The constant spikes in the graph from the last 5 years are because the sales of macbooks and chomebooks increase at holidays including Christmas and Black Friday.