Mobile cloud computing combines cloud computing and mobile networks to benefit mobile users, network operators, and cloud providers. It refers to infrastructure where both data storage and processing occur outside the mobile device. Key requirements for mobile cloud computing include simple APIs for transparent access to mobile services without specific network knowledge, web interfaces, and internet access to remotely stored applications in the cloud. While challenges include costs, availability, heterogeneity, and security, mobile cloud computing offers benefits like increased processing speed and storage, improved reliability, and extended battery life for applications like offloading computation and mobile games.