What do you mean by the sodium-potassium pump?

(N/A) The sodium-potassium pump is a biological mechanism that maintains a significant concentration gradient of $Na^+$ and $K^+$ ions across the cell membrane. It actively transports $3$ $Na^+$ ions out of the cell and $2$ $K^+$ ions into the cell against their respective concentration gradients,utilizing energy from the hydrolysis of $ATP$.