This organic chemistry video tutorial provides a basic introduction into spin spin splitting / coupling as it relates to proton NMR spectroscopy. It explains how to use the N+1 rule to determine the multiplicity of a H NMR signal. It also discusses the intensity ratio of singlets, doublets, triplets, quartets, quintets, sextets, and septets using pascal's triangle. It also provides an intro into complex splitting by using a triplet of quartets and a quartet of triplets signal as an example which can be simply referred to as a multiplet.