What is difference between Omega 3 and DHA?

What is difference between Omega 3 and DHA?


Docosahexaenoic Acid (DHA) DHA is a long chain omega-3 fatty acid 
important for brain and eye development and function throughout life. 
It also supports heart health. DHA is the most abundant omega-3 in the 
brain and retina and is naturally found in breast milk.