Keep in mind that an advisory board is not the same as a board of directors. A board of directors is formal mechanism that has a legal role and authority. They are elected by the shareholders and act as shareholder representatives and have certain legal and business powers An advisory board doesn’t have any official authority. In addition, any company can have an advisory board, but they’re not mandatory. Public companies, on the other hand, are required to have a board of directors. And while advisors typically meet with the company leaders intermittently, the board of directors must meet at scheduled times.