Residual writing means you write something
once and get paid several times. Depending on the publisher, you could continue to earn money on an article that you have written for the rest of your
life without ever touching the article again.
The good thing about
residual income is if you accumulate enough articles online and receive
residual income on all of them, you can conceivably continue earning without working. The downside is that you will need a large
foundation of articles in order to develop a sustainable
income. There are the occasional fluke articles that seem to earn right out of the starting gate and other times there are
financial duds (although the article is well written and informative, from an
earnings standpoint it's a dud).