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The kidneys are paired retroperitoneal organs located between the T12 and L3 vertebrae, positioned lateral to the spine and adjacent to multiple abdominal structures. Each kidney comprises the renal parenchyma—divided into cortex and medulla containing nephrons, the functional units—and the collecting system, which conveys urine to the ureter (see Image. Kidney Anatomy). The kidneys perform essential roles in excreting nitrogenous wastes, regulating electrolytes and acid-base balance, controlling blood pressure, reabsorbing vital substances, and producing hormones such as erythropoietin and calcitriol. The kidneys hold clinical significance due to their roles in waste excretion, electrolyte and acid-base regulation, blood pressure control, and hormone production, making preservation of renal function essential in disease management. In surgery, the kidney’s end-artery vascular anatomy requires careful protection of accessory renal arteries and the Brodel line, while nephron-sparing techniques enable targeted parenchymal resection to preserve renal function and minimize ischemia. A thorough understanding of renal anatomy and physiology enables clinicians to optimize diagnostic, medical, and surgical interventions while minimizing complications.