They also help reduce inequalities, improve terms and conditions and work with the Welsh Government on issues such as terms and conditions, pay, organisational change, policies and procedures.
Maent hefyd yn helpu i leihau anghydraddoldebau, gwella telerau ac amodau ac yn gweithio gyda Llywodraeth Cymru ar faterion fel telerau ac amodau, cyflog, newid sefydliadol, polisïau a gweithdrefnau.