Today is the era of Cloud Computing Technology in IT Industries. Cloud Computing is Internet-based computing, whereby shared information, resources, and software, are provided to terminals and portable devices on-demand. The rapid development of mobile technology and wireless networking and drives a strong demand for Mobile Cloud Computing (MCC). In MCC environment Cloud Computing, Mobile Computing and Networking are combined to offer cloud based services to mobile users where the data are stored and applications are processed in a centralized computing applications located in the cloud. In this paper first, we present the overview of MCC in terms of architecture, deployment models, service models and applications of MCC. Then we outlined issues and challenges related to MCC.