Poker chips are small disks. They made by various materials including molded plastic, colored metal  molded clays. They are used in table games as play money. Modern poker traces its roots towards the 1800s, and in those days, players used what you could to help keep a tally. Coins, gold dust and nuggets were used until they considered replacing with something which would indicate them. Thus, the casino chips happen to be introduced within the gambling business.