It does this through independent advice to Welsh Ministers, Welsh Government officials, and through advice, information or assistance to any public authority such as local authorities.
Mae’n gwneud hyn drwy roi cyngor annibynnol i Weinidogion Cymru, swyddogion Llywodraeth Cymru, a thrwy roi cyngor, gwybodaeth neu gymorth i awdurdodau cyhoeddus megis awdurdodau lleol.