Embark is the public transit agency of the COTPA trust, the largest transit agency in the state of Oklahoma. Embark has 20 interconnecting bus routes covering the city of Oklahoma City and parts of the Oklahoma City Metropolitan Area, including weekday Express service from Norman to Downtown Oklahoma City. Embark also operates paratransit, the Oklahoma City Streetcar, downtown public parking, bike share, and river ferry services. Additionally, Embark provides administrative and executive support for the Regional Transportation Authority of Central Oklahoma.

The Oklahoma City metropolitan area is an urban region in Central Oklahoma. It is the largest metropolitan area in the state of Oklahoma and contains the state capital and principal city, Oklahoma City. It is often known as the Oklahoma City Metro, Oklahoma City Metroplex, or Greater Oklahoma City in addition to the nicknames Oklahoma City itself is known for, such as OKC or "the 405".