The primary function of the House of Lords in the United Kingdom is to act as the upper chamber of Parliament, revising and reviewing legislation proposed by the House of Commons. Composed of life peers, bishops, and hereditary peers, the House of Lords scrutinizes bills, offering amendments and recommendations. While it does not have the power to block legislation outright, it can delay and influence decisions, playing a significant role in the parliamentary process and ensuring careful consideration of laws before they are enacted.