There is no review paper available on Artificial Intelligence (AI) applications to e-commerce to the best of knowledge. This paper is a survey of various AI techniques that are used in the design and development of e-commerce systems. The techniques are categorized into three groups namely, AI techniques for B2B e-commerce, AI techniques for B2C e-commerce, and AI techniques for both B2B and B2C e-commerce. In addition, this paper presents how the AI techniques are used in e-commerce.