Sadaqah Nafilah is the voluntary act of charity given purely out of compassion and generosity. It is the relief you provide for the betterment of society and to please our Creator.
It can be as simple as the smile you give to your neighbor, or harm removed from the streets, providing food to those less well off or a well dug to provide fresh water to people.
Counter-intuitively, Allah is aware of peoples’ deep desire to hoard wealth and their aversion to loss, He promises those that give charity that they will suffer no loss but rather only growth in their wealth, both in this world and the next.