A buckboard is a four-wheeled wagon of simple construction meant to be drawn by a horse or other large animal. The "buckboard" is the front-most board on the wagon that could act as both a footrest for the driver and protection for the driver from the horse's rear hooves in case of a "buck". The buckboard is steered by its front wheels, which are connected to each other by a single axle. The front and rear axle are connected by a platform of one or more boards to which the front axle is connected on a pivoting joint at its midpoint. A buckboard wagon often carries a seat for a driver. Such a seat may be supported by springs. The main platform between axles is not suspended by springs like a carriage. Made in the 1700s around the same time as carriages.
Originally designed for personal transportation in mountain regions, these distinctively American vehicles were widely used in newly settled regions of the United States. 
Some Cyclecars eg the Smith Flyer were also referred to as 'Buckboard Cars".