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With an exploding growth of the mobile applications and emerging of cloud computing, mobile cloud computing (MCC) has become a potential technology for mobile services. MCC is the combination of cloud computing, mobile computing and wireless networks to bring rich computational resources to mobile users, network operators, as well as cloud computing providers. Despite increasing usage of mobile computing, exploiting its full potential is difficult due to its inherent problems such as resource scarcity, frequent disconnections and mobility. MCC can address these problems by executing mobile applications on the resource providers’ side. In this paper, we give a definition of mobile cloud computing and provide anoverview of state-of-the-art progress, in particular, models of mobile cloud applications. We also highlight research challenges in the area of mobile cloud computing. We conclude that mobile cloud computing can help building more powerful mobile applications.