Dongguan and Campinas, Brazil formally become sister cities in April 2016.

Campinas is a Brazilian municipality in S？o Paulo State, part of the country's Southeast Region. According to the 2010 Census, the city's population is 1,080,999, making it the fourteenth most populous Brazilian city and the third most populous municipality in S？o Paulo state. The city's metropolitan area, Metropolitan Region of Campinas, contains twenty municipalities with a total population of 3,656,363 people.

Campinas is the richest city in the metropolitan region of Campinas and the 10th richest city in Brazil. Currently, the city concentrates 10% of industrial production of Brazil. The paper highlights the high-tech industries and metallurgical park, considered the capital of Silicon Valley Sterling. 

The Campinas Metropolitan Region is home to many national and international high-tech industries and IT companies, including IBM, Dell, Motorola, NXP, Lucent, Nortel, Compaq, Celestica, Samsung, Alcatel, Bosch, 3M, Texas Instruments and CI&T.

Campinas also boasts the largest number of high-tech business incubators and industrial parks (a total of eight), such as the CIATEC I and II, Softex, TechnoPark, InCamp, Polis, TechTown, Industrial Park of Campinas and others.