Industry?

[The Laboring Peoples]

What is industry? I look in my Nation Analysis and see things like "Mining" and "Pizza Delivery."
How do I get better industry? How does better industry affect me?

[The Most Glorious Hack]

a : systematic labor especially for some useful purpose or the creation of something of value
b : a department or branch of a craft, art, business, or manufacture; especially : one that employs a large personnel and capital especially in manufacturing
c : a distinct group of productive or profit-making enterprises <the banking industry>
d : manufacturing activity as a whole <the nation's industry>

Hence Industry: Mining, Industry: Auto Manufacturing, etc. You generally improve it by pro-business practices.