Benign liver tumors are non-cancerous growths in the liver, commonly including hemangiomas, focal nodular hyperplasia, and hepatocellular adenomas. They are clinically significant as they can cause symptoms like abdominal pain or discomfort, and may require monitoring or intervention if they grow large or cause complications such as bleeding. A key association is with oral contraceptive use, particularly in hepatocellular adenomas, which can increase the risk of complications.