What is the purpose of a "gasket" in engine systems?

The purpose of a gasket in engine systems is primarily to create a seal that prevents leaks between mating surfaces. Gaskets are essential components that are placed between two surfaces that are bolted together, such as cylinder heads and engine blocks, or between flanges in piping systems. The material of the gasket compresses when the surfaces are tightened together, filling any small gaps and ensuring that fluids such as oil, coolant, and gases do not escape from the engine or other systems. This sealing function is critical for maintaining proper engine operation and efficiency, as leaks can lead to significant problems such as loss of pressure, contamination of fluids, and ultimately, engine failure.