Omega-3 fatty acids

What are Omega 3 Fatty Acids?  

Omega-3 fatty acids refer to a group of fatty acids found in every cell of the body and consist of 3 unsaturated acids - EPA, DHA and ALA. These three acids play a vital role in our cells, they can affect the function of cells in the body, and they can also heal or protect cells from damage. So how to supplement Omega-3 fatty acids? What are the foods rich in omega-3?