The primary source of omega-3 fatty acids is fish, particularly fatty fish like salmon, mackerel, and sardines. Omega-3s are essential fats that contribute to heart health, reduce inflammation, and support brain function. They can also be found in plant-based sources such as flaxseeds, chia seeds, and walnuts. Incorporating these foods into one's diet can help ensure adequate omega-3 intake, promoting overall health and wellbeing.