A Taxpayer Identification Number (TIN) is important to obtain if you are doing business in, or wish to do business in, the United States.
A Taxpayer Identification Number (TIN) is an identifying number for tax purposes in the United States. This number may be in the form of a Federal Employer Identification Number (FEIN) or a Social Security Number (SSN). Visit the IRS site to get a TIN here.
A W-8 form is a Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding, used by foreign persons and corporations to certify their non-U.S. status. This provides the benefit of avoiding or reducing tax withholding from U.S. source income. Visit the IRS site to get a W-8 form here.