The molecules hydrogen, oxygen and carbon make up omega-3 fatty acids. Omega-3 are polyunsaturated fats and have a broad range of health benefits. The health benefits include better mood, heart health, anti-inflammation, improved cognition and even anti-cancer properties. There are 11 omega-3 fatty acids, and the 3 most important types are ALA, EPA and DHA.
The following infographic from AuthorityDiet.com goes into detail on where to obtain the 3 types of omega-3 fatty acids, and the health benefits you can reap by getting sufficient amounts of these fatty acids in your diet.