Well... how about never needing to mess with encoding settings again?
Ever needed to display several languages on one page or site and something always came up in Giberish?
With utf-8 (a variant of Unicode) glyphs (character forms) of basically all languages can be displayed with one single encoding setting.
Acessibilidade
Tela sem cor
Contraste brilhante
Contraste inverso
Aumentar o texto
Diminuir o texto
Texto legível