This is the 2nd most frequent Ukrainian word.
що
The Ukrainian word "що" means "what" or "that" depending on context.
'What' as a question word to inquire about information.
Що ти зараз читаєш?
What are you reading right now?
'That' as a conjunction introducing a subordinate clause.
Я знаю, що ти там був.
I know that you were there.
'That' used to introduce a relative clause describing 'everything'.