It includes data from Census 2021 about the ability of usual residents aged three years and older living in Wales to understand spoken Welsh, and to speak, read or write Welsh.
Mae’n cynnwys data o Gyfrifiad 2021 ar allu preswylwyr arferol tair oed neu hŷn sy’n byw yng Nghymru i ddeall Cymraeg llafar, siarad, darllen neu ysgrifennu Cymraeg.