What is the real meaning of "merit making"?

Literally speaking, the word ‘merit’ is translated from Pali Punna a which means "purification": To make merit is to cleanse greed, hatred and delusion from one’s mind. The Buddha taught His followers to make merit by means of charity (Dana), morality (Sila) and spiritual development (Bhavana). When we know the real meaning of "merit making" in Buddhism as described above we can decide for ourselves that there are many ways and means to make merit. At any moment in one’s daily life, even while sitting comfortably on a chair, trying to cleanse greed, hatred, delusion or other mental defilements from one’s mind is also reckoned as making merit.