What use(s) can big data have in our society? For example, i know it helps with collecting peoples interests for advertising. I was wondering what else?

2 answers

law enforcement, building design, many areas where there is a lot of information.
The census!

www.2020census.gov

Examples from earlier data:
https://www.census.gov/quickfacts/houstoncitytexas
How else do you think companies and agencies would use all this information?