Wu Hequan said, what can you do on the Internet in a day? For Tvitter, 200 million Weibo posts, 7 TB, and 5 billion words are added in a day, which is almost twice the number of words in the New York Times in 60 years; for Facebook, 250 million photos can be uploaded in a day, equivalent to 300 TB. On the Chinese Taobao website, there are tens of millions of transactions a day, with an approximate data volume of 20 TB. If the amount of information on the world's Internet in one day were to be installed on a DVD disc, it would require 168 million discs, approximately 800,000 hard drives, accounting for approximately 800 EB. Internet traffic changes dramatically. In 1998, the average monthly traffic of an Internet user was only one MB. By 2000, it reached 10MB. By 2008, the average traffic of an Internet user was 1,000MB. By 2014, it was 10,000MB. For example, recently, the number of videos uploaded to YOUTube in two months exceeded what ABC, NBC and CBS broadcast continuously 247/365 since 1948. "How to manage such a large amount of information requires the use of big data." Wu Hequan said that big data itself has four characteristics: excessive volume, high speed, variation, and value. Big data has a wide range of application fields, including medical care, transportation, finance, logistics, security, etc.

Editor: Wang Xiaoyu