Why does a jet ski pump water out the exhuast?

A jet ski pumps water out of the exhaust as part of its propulsion system. It uses a jet propulsion mechanism that draws water from the body of water, pressurizes it, and then expels it through the exhaust. This process not only creates thrust to propel the jet ski forward but also cools the engine by circulating water through it. The expelled water creates a visible spray, which is characteristic of jet ski operation.