It is necessary to identify these positions when you incorporate.
Shareholders are « owners » of the corporation. They are liable to the corporation only to the extent of their investment. Their contribution can be monetary, in assets, in knowledge or in activities. Shareholders elect the directors.
Directors oversee the overall functioning and management of the corporation. They define the strategic orientations of the corporation. They can be liable for what the corporation does if it stems from a wrongful decision they took. They nominate the officers.
Officers are in charge of the corporation. They are the ones responsible for its day-to-day operations.