Prif ddiben y Gyllideb Atodol hon yw dangos y newidiadau cyllidebol ers Cyllideb Derfynol 2017-18 a gyhoeddwyd gan Lywodraeth Cymru ym mis Rhagfyr 2016.
The main purpose of this Supplementary Budget is to reflect the budgetary changes since the Final Budget 2017-18 published by the Welsh Government in December 2016.