Visitors experience a VR game at the 13th CIS in Nanjing on Sept 6, 2017 [Photo/ Asianewsphoto.com]

The 13th China International Software Product and Information Service Trade Fair (CIS) kicked-off in Nanjing, capital city of East China's Jiangsu province, on Wednesday.

The four-day fair, themed with "software defines the world, data drive the future", covered areas including software, big data, internet plus and artificial intelligence. It also attracted more than 1,300 companies from across 30 countries to participate.