An introduction to multidimensional coherent spectroscopy (MDCS) is provided in this chapter. We start out by introducing MDCS in qualitative terms, as an extension of transient absorption spectroscopy. We proceed to discuss the meaning and utility of coherent spectroscopy more generally. We go on to discuss the specifics of MDCS as a specific form of coherent spectroscopy. Pulse sequences involved in generating MDCS plots are introduced. Finally, we discuss density matrix perturbation theory and double-sided Feynman diagrams, and the role of this formalism in simulating and interpreting MDCS.