raise money to finance their companies
find investors for their businesses
offer expert financial advice
Step-by-step explanation:
Investment banks are essentially avenues for investors to find good investment avenues in the work of the entrepreneurs and for entrepreneurs to find viable investors who will take their company forward by financing it.
The financing of this sort is often advised by the bank for the mutual profit of the two parties.
As such an avenue they are in a position to advice the entrepreneur on which opportunity to take and which to pass on.