Tax administration is the backbone of the IRS's operations, encompassing everything from processing returns to enforcing tax laws. It aims to promote voluntary compliance while using technology and data analytics to identify potential non-compliance and target enforcement efforts. The IRS is structured into four main divisions, each serving different types of taxpayers. Its functions include processing returns, providing taxpayer services, conducting audits, and enforcing tax laws. The agency balances efficient tax collection with protecting taxpayer rights and privacy.