Conkers are the seeds of the horse chestnut tree, known scientifically as Aesculus hippocastanum. They are typically round, shiny, and brown, with a hard outer shell. Conkers fall from the tree in autumn and are often collected by children for play. In the traditional game of conkers, players take turns striking each other's conker with their own, aiming to break it. The game has been popular in the United Kingdom and other parts of Europe for generations. Conkers can also be used in crafts and as natural decorations during the fall season.