The US FDA (United States Food and Drug Administration) is an organization that safeguards public health in the United States by ensuring the safety and security of food supply, cosmetics, human and veterinary drugs, biological products, and medical devices.
Not just this, FDA also regulates the manufacturing, marketing, and distribution of tobacco products to decrease the use of tobacco by minors.
FDA is also responsible for improving public health by boosting innovations in medical products to make them more effective, safer, and more budget-friendly. 
Moreover, it provides accurate scientific information to the people about how they need to consume medical products and foods so they can not just maintain but also improve their health.
In order to safeguard the consumers, the FDA requires that certain products must meet certain safety and quality standards before the can be sold in the United States. FDA certification is a validation indicating that a product has met FDA standards and is approved for sale in the US. This certification demonstrates to consumers that a product is safe for use.