Thuế GTGT là gì?

THUE-GIA-TRI-GIA-TANG-HANG-PHI-MAU-DICH
CHINH-SACH-THUE-GTGT-DOI-VOI-KHOANG-THUONG-CHO-DAI-LY
THUE-GTGT-DOI-VOI-DICH-VU-QUAN-TRI-HE-THONG-CNTT
hoan-thue-gtgt-trong-truong-hop-cong-ty-xuat-khau-hang-hoa-ma-thay-doi-ma-so-thue
huong-dan-ke-khai-thue-gtgt-doi-voi-chi-nhanh
quy-dinh-ve-dau-nguoi-ban-tren-hoa-don-dien-tu-chuyen-doi
Thue-GTGT-voi-dich-vu-moi-gioi-van-tai-quoc-te