A Tax Identification Number (TIN) is a unique identifier assigned to individuals and businesses for tax purposes. It is used by the government to track tax obligations and ensure compliance with tax laws. In the United States, the TIN can take various forms, including a Social Security Number (SSN) for individuals or an Employer Identification Number (EIN) for businesses. Having a TIN is essential for filing tax returns, opening bank accounts, and applying for loans. It helps streamline the tax process and prevents identity theft by ensuring that each taxpayer is uniquely identified. Overall, a TIN is a crucial component of the tax system.