Sodium-dependent transporters are proteins found in cell membranes that use the energy from sodium ions (Na+) to help move other substances into or out of cells. These transporters play a crucial role in maintaining the balance of nutrients and ions within cells, facilitating processes like nutrient absorption and waste removal. These transporters are essential for various physiological functions, including the uptake of glucose and amino acids. By relying on the concentration gradient of sodium, they ensure that cells can efficiently acquire the resources they need to function properly, contributing to overall cellular health and homeostasis.