To answer a need that the public has. Other than that, you're going to have to narrow down your question.
If you create a bakery to sell cupcakes, you are satisfying a need that someone has - to create and sell something they want but don't have time or the inclination to do themselves.
What is the purpose of business? Well, it is the reason why you have the things that you want or need that is product-based or service-based.
If we want to know what a business is, we have to start with its purpose. And the purpose must lie outside the business itself. In fact, it must lie in society, since a business enterprise is an organ of society. There is only one valid definition of business purpose: To create a customer.
The customer is a foundation of a business and keeps it in existence. The customer alone gives employment. And it is to supply the customer that society entrusts wealth-producing resources to the business enterprise.
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