The taxi industry has boomed with the rise of taxi aggregators and ride-sharing services enabled by mobile apps. This document describes two main types of taxi services - radio taxi companies that own fleets and hire drivers, and taxi aggregators like Uber that connect independent drivers with riders through a mobile app. Uber in particular is discussed, including its business model, expansion, controversies, and competitors like Lyft. Instant messaging apps are also moving into the taxi space through partnerships that allow users to book rides within the messaging platforms.