In recent years, mobility on demand (MOD) is gaining popularity among mobility consumers. This innovative concept is based on the principle that transportation is a commodity where modes have economic values that are distinguishable in terms of cost, journey time, wait time, number of con-nections, convenience, and other attributes. MOD enables consumers to access mobility, goods and services on demand by dispatching or using shared mobility, delivery services and public transportation solutions through an integrated and connected multi-modal network. This chapter describes the different services that have emerged in the MOD ecosystem and the core enablers of MOD, such as stakeholders, business models and technology. The chapter concludes with a discussion of how MOD and vehicle automation could impact cities and the transportation network and their energy use.