The Internal Revenue Service (IRS) is the federal agency responsible for administering and enforcing the tax laws of the United States. It collects taxes, processes tax returns, and issues refunds to taxpayers. The IRS also provides guidance on tax regulations and ensures compliance through audits and investigations. Established in 1862, the IRS operates under the Department of the Treasury. It plays a crucial role in funding government operations by collecting revenue from individuals and businesses. The agency also offers resources and assistance to help taxpayers understand their obligations and file their taxes accurately.