Plymouth was a marque of automobile

Automobile

An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...

 based in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, produced by the Chrysler Corporation

Chrysler

Chrysler Group LLC is a multinational automaker headquartered in Auburn Hills, Michigan, USA. Chrysler was first organized as the Chrysler Corporation in 1925....

 and its successor DaimlerChrysler.
The Plymouth automobile was introduced on July 7, 1928. It was Chrysler Corporation's first entry in the low-priced field, which at the time was already dominated by Chevrolet and Ford. Plymouths were actually priced slightly higher than their competition, but offered standard features such as internal expanding hydraulic brakes that the competition did not provide.