Business is an organization or enterprising entity engaged in commercial, industrial or professional activities. A business can be a for-profit entity, such as a publicly-traded corporation, or a non-profit organization engaged in business activities, such as an agricultural cooperative.
In simple words, anything related to a money transactions entitled to a profit or loss to an individual or a company. Correct me if I am wrong or Mind your own business!!!.
For more refer wikipedia , Investopedia