used after words beginning with any-, every-, no- and some-, or after how, what, where, who, why but not which, to mean other, another, different, extraEverybody else has (= All the other people have) agreed except for you.
If it doesn't work, try something else (= something different).
Let's go before they ask us to visit anyone else (= another person).
It's not my bag. It must be someone else's (= it must belong to another person).
The book isn't here. Where else (= In what other place) should I look?
He came to see you. Why else (= For what other reason) would he come?
After I'd thanked them I didn't know what else (= what other things) to say.