产业 vs 企业 vs 商业. What's the difference?
企业: enterprise/corporation; business(only the organization, not the activity it engages in)

产业: industry; business(the activity but not the company/organization).


eg. 软件产业=software industry/business, 房地产(业)=real estate (business)


商业: commerce/commercial


eg. 商业(的)银行=commercial bank, 商业(的)软件=commercial software