This primer gives a brief overview of the basic ideas behind NMR spectroscopy and how they can be used to study a wide range of solid systems. In other words, both interactions had to do with how molecules were aligned. But molecules in solids don’t move around very much, and the way they move is important. So, both of the interactions have a big impact on solid-state NMR, which is why the peaks are much wider than they are in solution-state NMR.