In this chapter, I review prices and firms' pricing strategies on the Internet through a broad survey of recent literatures on economics, information system, and marketing. In both empirical and theoretical studies, I carefully identify two causes of price dispersion, a pervasive and persistent phenomenon observed in many homogenous product markets: market friction and product differentiation. In experimental studies, I document pricing strategies arising from both laboratory and field experiments. Finally, recent studies of online pricing issues using international data are also exposited.