To understand this let’s back to the time when the first paintball gun was invented. The founder of Nelson Paint Company, Charles Nelson designed the first paintball gun to help the US forest department mark trees that were needed to cut down.
Moreover, it was also used by the rancher to mark wandering cows. Hence, giving it the name “paintball marker”.
Later, paintball was converted into a recreation extreme sport and now a day it is played by thousands of people.