asking for information specifying something

what is your name?

I'm not sure what you mean

the thing or things that (used in specifying something)

what we need is a commitment

(in exclamations) emphasizing something surprising or remarkable

what some people do for a crust!

asking for information specifying something

what time is it?

do you know what excuse he gave?

(referring to the whole of an amount) whatever

he had been robbed of what little money he had

(in exclamations) how great or remarkable

what luck!

what a fool she was

to what extent?

what does it matter?

used to indicate an estimate or approximation

see you, what, about four?

used for emphasis or to invite agreement

pretty poor show, what?