What is a sulky?

A sulky is a lightweight, two-wheeled cart designed for one or two passengers, commonly used in harness racing or for recreational driving. It is typically pulled by a horse and allows for a streamlined and efficient way to race or travel. Sulkies are characterized by their minimalistic design, which helps reduce weight and enhance speed. In a broader context, "sulky" can also refer to a person who is sullen or withdrawn, but this is unrelated to the cart itself.