Today, China is considered as the manufacturing hub of the world. It has a very high population, and as a result, labour is easily available at the lowest cost.
Besides that, over the years China has made tremendous improvement in its infrastructure and as a result, created a huge production capacity.
Also, the Chinese government has taken special care in the education and training of its population and as a result, there are very high numbers of skilled workforce available.
Today, China outranks almost every other country in its manufacturing output. Virtually everything that you use today is most likely manufactured in China.