what is different between "commerce" and "business" ?

Answer 1

Commerce is the trading of something of economic value such as goods, services, information or money between two or more entities.

Business is the social science of managing people to organize and maintain collective productivity toward accomplishing particular creative and productive goals, usually to generate revenue. Business can also refer to a particular company or corporation, and refer to a particular market sector.

So commerce is what a business does to reach it's goals.