A multistage centrifugal blower is a type of blower that uses multiple impellers (stages) mounted on a single shaft to increase the pressure of air or gas. Each stage consists of an impeller and a diffuser, and the air or gas is compressed incrementally as it passes through each stage. This design allows for higher pressure outputs compared to single-stage blowers, making multistage centrifugal blowers suitable for applications requiring substantial pressure increases.