HM Revenue and Customs (HMRC) is the UK government department responsible for collecting taxes, paying some forms of welfare, and enforcing the law regarding tax and customs. It ensures that individuals and businesses comply with tax regulations and helps fund public services through the revenue it collects. In addition to tax collection, HMRC also manages the National Insurance system, which provides benefits and pensions to citizens. The department plays a crucial role in tackling tax evasion and fraud, ensuring that everyone pays their fair share to support the economy and public services.