Translation

1. who (what person or people) interrogative

   Wer hat das gesagt?

   Who said that?

2. what, which (one) (see usage notes) colloquial, interrogative
3. whoever, he who, someone who, the person who, anyone who (whatever person or persons) relative

   Wer eine Frage hat, kann sich jetzt melden.

   Whoever has a question, put up their hands now.

   Wer im Glashaus sitzt, soll nicht mit Steinen werfen.

   People who live in glass houses shouldn't throw stones.

4. somebody, someone; anybody, anyone (an unspecified person) colloquial, indefinite

   Da ist wer an der Tür.

   There's someone at the door.