Prif ddiben y Gyllideb Atodol hon yw dangos y newidiadau cyllidebol ers Cyllideb Atodol Gyntaf 2018-19 a gyhoeddwyd gan Lywodraeth Cymru ym mis Mehefin 2018.
The main purpose of this Supplementary Budget is to reflect the budgetary changes since the First Supplementary Budget 2018-19 published by the Welsh Government in June 2018.