As a food service worker, you play an essential role in ensuring the safety and health of your customers. You handle and prepare food on a daily basis, and it's crucial that you understand how to do so in a safe and sanitary manner. A food handlers certificate is a document that certifies an individual has completed a food safety training course and understands how to handle and prepare food in a safe and sanitary manner. This certificate is required by most states and municipalities for individuals who work in food service, including restaurants, cafes, delis, and caterers.