Caps, particularly baseball caps, are the most popular style of headwear that originated in the United States in the late 19th century.They were initially designed for baseball players to protect their faces from the sun and later became a global fashion trend.Caps also have important roles in professional and organizational contexts, such as military caps, police caps, academic caps, and chef's caps.In sports, being capped refers to representing one's country in a real game, such as in cricket.