This chapter considers normal-form games with finite action sets, hence matrix games. Two-player bimatrix cases are treated first, followed by m-player matrix games, both introducing pure- and mixed-strategy Nash equilibrium concepts. The concepts of dominance and best replies are reviewed, as well as Nash equilibria theorem and Nash equilibria refinements. Results are mostly adapted from (Basar and Olsder in Dynamic Noncooperative Game Theory. SIAM Series Classics in Applied Mathematics, 1999; Owen in Game Theory, Academic Press, San Diego, 1995).