The correct answer is: Your employer sends it to the federal government to help pay your income tax bill.
When your employer withholds money from your paycheck, it typically includes federal income tax, Social Security tax, and Medicare tax. These amounts are sent to the government on your behalf to help cover your income tax obligations and other federal liabilities. When you file your tax return at the end of the year, you will reconcile the amount withheld with your actual tax liability, which can result in a refund or additional payment depending on your overall tax situation.