answer:Hi occ! I am guessing you want to know what it is they typically do. First, let's get the terms down. CEO is the Chief Executive Officer. Their responsibilities depend on the size of the company. This person is responsible for overall direction, keeping the company competitive and visionary for their space. They speak to wall street quarterly. They are where the buck stops on any decision. COO is the Chief Operations Officer. They are responsible for the tactical execution that keeps the company running on a day-to-day, year-to-year basis. CFO is the Chief Financial Officer. Accountant Extraordinaire. Responsible for proper financial business practices, accounts payable and receivable, financial planning and keeping the company on financial track as per its vision and goals. Answers to the CEO and to the SEC (Securities and Exchange Commission). CTO is the Chief Technology Officer. Responsible for developing and implementing technology strategy.