What is Happiness?

What is happiness? This is a genuine question and I'd appreciate if you would give me your honest opinion. How do you define happiness? I have my thoughts on it, but in order to come up with a robust definition, I want to know what you think.

Please take a few minutes to think about it and either comment below, message me on social media (facebook, instagram), or even email me at john@aheartforrunning.com. I'll keep the responses anonymous and post up the results, if I get any, along with my thoughts in my next article.

Thank you all in advance for taking your time to define what is happiness.