I think happiness is a satisfactory feeling that brings joy to the heart, smile on one's face and great relief to the nerves.
Happiness is achieved in many ways and varying levels. A student who has worked hard all year round to get good grades to get into university will show a real sense of relief and happiness when it receives the entry score required to get into the course he/she wants.
A couple who are blisfully blessed with a baby will experience deep sense of satisfaction and happiness when the newborn finally comes out into this world. Someone who is celebrating his/her birthday today may express gratitude and happiness for another year of life.
A medical researcher may be ecstatic and happy for discovering a breakthrough in the treatment of cancer. This feeling may also be experience by a product developer in an advertising company when it nails the concept of selling the new product thanks to his/her original creative concept.
A postman who has delivered a lost mail to its rightful owner must be feeling a sense of pride and happiness for the extra mile he/she puts in to locate the mail.
In all of the above situations, individuals experience a feeling of satisfaction and happiness for accomplishing or achieving something that is worthy and important to them. In most cases, there is an input of hardwork and real efforts to make it work hence when the mission is accomplished, we see them like us jump with joy, shout with glee and smile happily.
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