An underwriter, a key player in the world of finance, is an investment firm that enters into a contract with a company to manage its Initial Public Offering (IPO). This entails a range of responsibilities, from purchasing any unsold IPO shares to determining the offer price and promoting the IPO to potential investors. The underwriter earns an underwriting fee for their services, making it a profitable venture for both parties involved. In essence, underwriters play a crucial role in the success of an IPO.