A business

Education industry is a business these days.
https://www.careerride.com/view/education-industry-is-a-business-these-days-1101.aspx
Please explain the use of "a" in "a business...".
Shouldn't it just "business"( no article) as I think the meaning of the noun "business" non count like a concept?

Business as a concept= no instances

Business = an individual instances , more than one , countable