Passive income is an income received on a regular basis, with little effort required to maintain it.
The American Internal Revenue Service categorizes income into three broad types, active (earned) income, passive income, and portfolio income. It defines passive income as only coming from two sources: rental activity or "trade or business activities in which you do not materially participate. Other financial and government institutions also recognize it as an income obtained as a result of capital growth or in relation to negative gearing.
Some examples of passive income are:
Earnings from a business that does not require direct involvement from the owner or merchant;
Rent from property;