What does "behalf" mean?

Native speaker’s answer
Rebecca
"Behalf" is a noun that means "representing" or for the good of or because of. It's common to use "on behalf of," which means in the interest of or as a representative of. Ex: On behalf of all of us, congratulations on your marriage. Ex: I bought the cake on his behalf since he couldn't do it. Ex: I called the doctor on behalf of my mother.