Say you write 10 articles a day for joe bloggs. One day you're feeling ill, and you know you won't be able to do them. What you do, is hire an outsourcing company who have a group of guys working for them, who will write the 10 articles for you. Basically, it's a company that does your work for you, for a fee.
It's easy. Find a bunch of people in India who can do the work you need for a cheap price. Find people in the West who need the services. Get the people in India to do to the work, and give them a cut of the money. You can find plenty of people willing to do cheap work here at DP or on other webmaster forums.
Outsourcing company is operate a business model as middle man.For example,if your company have shortage of engineer,then you ask the OC to sent 1 engineer to work at your company. You must be registered business before you can legally operate this business and you will need to have a pool of professional coz nowday many company ask OC to search for talented professional.