GMAT Vouchers
GMAT vouchers are sometimes provided to test takers who experienced a technical issue during their exam by GMAC Customer Care.
Vouchers are not transferable, and should only be used by the person it was issued to.
GMAT Fee Waivers
GMAT Fee Waivers are provided by schools to candidates for whom exam fees would be a financial hardship.
Fee Waivers are not transferable, and should only be used by the person it was issued to.
You may also find these articles helpful:
GMAT: How Can I Request A Fee Waiver For My Exam?
GMAT: Can I Use a GMAT Voucher that was NOT Given Directly to Me?