This presentation will provide an introduction to relaxometry and Magnetic Resonance Fingerprinting (MRF). In the first half of the talk, we will cover conventional parameter mapping techniques and discuss several state-of-the-art non-fingerprinting approaches for multiparametric mapping. During the second half, we will provide an overview of MRF including pulse sequence design, k-space data sampling, dictionary generation, and pattern matching. Special topics will also be presented, including approaches to correct for confounding factors, dictionary compression, novel low-rank and deep learning reconstruction methods.