Demand-responsive transport (DRT), also known as demand-responsive transit, demand-responsive service, Dial-a-Ride transit, flexible transport services, Microtransit, Non-Emergency Medical Transport (NEMT), Carpool or On-demand bus service is a form of shared private or quasi-public transport for groups traveling where vehicles alter their routes each journey based on particular transport demand without using a fixed route or timetabled journeys. These vehicles typically pick-up and drop-off passengers in locations according to passengers needs and can include taxis, buses or other vehicles. Passengers can typically summon the service with a mobile phone app or by telephone; telephone is particularly relevant to older users who may not be conversant with technology.

Transport for Wales is a not-for-profit company owned by the Welsh Government and managed at arms length by its appointed board. TfW oversees the Transport for Wales Group consisting of itself and its subsidiaries: Transport for Wales Rail, the train operator of the Wales & Borders railway franchise; Pullman Rail Limited; and TfW Innovation Services Limited, a joint venture between TfW (51%) and former operator KeolisAmey Wales (49%).