Explanation:

- The sodium-potassium pump is a membrane protein that transports sodium ions (Na+) out of the cell and potassium ions (K+) into the cell.

- This process requires energy in the form of ATP (adenosine triphosphate), which is hydrolyzed to ADP (adenosine diphosphate) during the transport process.

- Active transport is a process that moves molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.

- In the case of the sodium-potassium pump, the concentration of Na+ is higher outside the cell than inside, and the concentration of K+ is higher inside the cell than outside.

- The pump uses the energy from ATP hydrolysis to move Na+ and K+ against their concentration gradients.

- The sodium-potassium pump is essential for maintaining the proper balance of Na+ and K+ concentrations inside and outside of cells.

- This balance is important for a variety of cellular functions, including maintaining the cell's resting membrane potential, regulating cell volume, and driving the transport of other molecules into and out of the cell.