Diffusion MRI Tractography is today the only imaging technique able to map the structural connectivity of the human brain in vivo non-invasively. Thanks to these unique capabilities tractography has become one of the pillars of modern neuroimaging and it is now adopted in several neuroscience and clinical research applications worldwide. In this lecture we will review the main concepts behind tractography methods from early DTI-based deterministic methods to more advanced High Angular Resolution Diffusion Imaging approaches. (Please note, more slides and topics are available in the video)