Prif ddiben y Gyllideb Atodol hon yw dangos y newidiadau cyllidebol ers Cyllideb Atodol Gyntaf 2020-21 a gyhoeddwyd gan Lywodraeth Cymru fis Mai 2020.
The main purpose of this Supplementary Budget is to reflect the budgetary changes since the First Supplementary Budget 2020-21 published by the Welsh Government in May 2020.