Meanings
interrogativewho (what person or people)
Wer hat das gesagt?Who said that?
colloquial · interrogativewhat, which (one) (see usage notes)
relativewhoever, he who, someone who, the person who, anyone who (whatever person or persons)
Wer eine Frage hat, kann sich jetzt melden.Whoever has a question, put up their hands now.
colloquial · indefinitesomebody, someone; anybody, anyone (an unspecified person)
Da ist wer an der Tür.There's someone at the door.
Examples
GermanEnglish
Wer A sagt, muss auch B sagen.In for a penny, in for a pound.
Wer bist du und was willst du?Who are you and what do you want?