Microtransit innovation is increasing as transit services look for new solutions to assist in increasing ridership and continuing to serve communities in the face of continued single occupancy and personal vehicle use, ongoing competition with private rideshare companies, and the challenges and uncertainties surrounding COVID-19. This whitepaper provides an overview of this expanding realm of microtransit and how it is filling the gaps in more traditional transit and transportation, between fixed-route transit bus services and private vehicles (including taxis and ride-hailing/ride-sharing vehicles).