Dialysis machines are devices used to replace the kidney's function in patients with kidney failure by removing waste, excess fluids, and toxins from the blood. There are two main types: hemodialysis, where blood is filtered outside the body, and peritoneal dialysis, where a solution in the abdomen absorbs waste. Key components include the dialyzer (filter), blood pump, dialysis solution, ultrafiltration control, and monitoring systems to ensure safe operation. These machines are crucial for managing symptoms and improving quality of life for patients with chronic kidney disease.