I need Clarification on Dating

I’m 21 (F) and I just started talking to this guy (26). He’s pretty cool so far and we have great banter and whatnot. I asked him what he was looking for and he said “Casual turns into serious if yall vibe”. I’m looking for something serious but don’t want to rush into anything. I’m wanting to know if these two things are the same but said differently? And if not what I should do. Also I want clarity on what exactly casual dating is.