なお has two main uses. First, it can mean 'still' or 'yet,' emphasizing that a situation remains unchanged despite expectations or time passing. For example, after someone says they are tired, you might say なお疲れている? meaning 'Are you still tired?' This usage often appears in written or formal speech, as in news reports or essays. Second, it means 'furthermore' or 'in addition,' used to add extra information to a statement. This is common in business announcements, notices, or formal letters, where you might say なお、会議は延期になりました meaning 'Furthermore, the meeting has been postponed.' In everyday conversation, you might hear it in set phrases like なおさら (even more so) or なおしても (even if you do...), but as a standalone adverb it sounds formal and is less common in casual chat. The word carries a slightly literary tone, so using it in casual conversation can make you sound bookish. For example, saying まだ instead of なお for 'still' is more natural among friends. Similarly, for 'furthermore,' それに or あと are casual alternatives. In writing, なお is a handy connector, especially in emails or reports, where it adds a polished touch.