what is cowboy?

well, i heard cowboy is in real but don't know what's cowboy and why do they wear cap always?
What is the work of cowboy? And why they are called cowboy?
Do you know anything about cowboys if yes then share it to with me.

The name sounds so lazy, so lacklustre, so… unexciting. It’s a little like when you came across Snakes On A Plane and knew that the film was just going to be bad. So it is actually a tremendous surprise when you come out of Cowboys & Aliens exclaiming “y’know what, that was actually good.

A real cowboy was a man that tended to the cattle of a farmer, the Hollywood "Cowboy" is however actually just an outlaw.

A cowboy is an animal herder who tends cattle on ranches in North America, traditionally on horseback, and often performs a multitude of other ranch-related tasks. The historic American cowboy of the late 19th century arose from the vaquero traditions of northern Mexico and became a figure of special significance and legend.