This tutorial or practical guide on seismic tomography is aimed at an audience familiar with basic seismology concepts and calculus. The intent is to provide the reader with a fundamental understanding of both seismic ray tomography and seismic diffraction tomography. Case studies illustrate processing method-ology, basic interpretation technique, and pitfalls. After reading through this presentation, one will have a greater understanding of and appreciation for seismic tomography articles found in the literature.