What makes you happy

In a recent conversation with a friend,this question came up.
What is happiness?
Yes....lot of times,I ask this to myself .
I ask myself when I feel down or depressed.
What is one thing that makes me happy ?Tough question to answer? Sometimes yes and sometimes not :-)

Doesn't happiness depend upon the state of your mind ?
It could be a feeling that comes out of a huge success/achivement or it could be a feeling that comes out of a very simple thing ,as simple as ,having a cup of coffee and be cozy on a rainy day.

Can we categorise happiness?
I feel happy by making my loved ones happy.
I feel happy when I achieve something.
I feel happy when I finish my todo list for the day.
I feel happy when I can talk my heart out to a good friend.
I feel happy when a loved one makes me feel that I am cared for,when I am feeling down.
I feel happy when I find something which I had been longing for.

Is satisfaction ,key for the happiness?
Is the idea of "To be content with what you have today" , an answer to find happiness?
If so,will it apply for everything?
If you are content with what you already have,wouldn't it hamper your growth?
Or you should be content as well as wise enough to decide where you need to progress and where you can stop?
Is it all your attitude which determines happiness?

As someone said,probably , "Happiness is not having what you want, but wanting what you have."