Mobile applications use a lot of common functions like social sharing, push notifications etc. Integrating these functions with backend needs to be done every single time with their APIs. mBaaS, Mobile Backend as a Service, makes this job a lot easier by offering an unified API.
Large enterprsie mobility solutions are looking forward to mBaaS as it offers a number of advantages over conventional mobile app development methods.
This infographics explains the basic concepts of mBaaS. [via]