Outsourcing is a very common business practice in the modern business world. It basically means to pay people from outside of your company, often outside your country, to do work for you.
For example, labor is relatively cheap in Vietnam and China, so many companies will set up factories in these two countries to get a lot of their goods produced. They will then ship these goods to their own country to sell. The labor is often so cheap, that even when they add all the shipping costs, the whole thing is still much cheaper. Many American manufacturing jobs are being lost because of outsourcing.