The W-2 form is an important tax document used in the United States. It is provided by employers to their employees at the end of each year, detailing the total wages earned and the taxes withheld from their paychecks. This information is essential for employees when filing their annual income tax returns. Employees use the information on the W-2 form to report their income to the Internal Revenue Service (IRS). The form includes various details, such as Social Security earnings and Medicare contributions, helping ensure accurate tax calculations and compliance with federal tax laws.