Fish oil is a dietary supplement derived from the tissues of oily fish, such as salmon, mackerel, and sardines. It is rich in omega-3 fatty acids, which are essential fats that the body cannot produce on its own. These fatty acids are known for their potential health benefits, including supporting heart health and reducing inflammation. Many people take fish oil supplements to help improve their overall health. They are available in liquid form or as capsules and can be found in health food stores and pharmacies. It's important to consult a healthcare professional before starting any new supplement regimen.