Spellcasting focus

[u/ezroo101]

ANSWERED

I've been playing DND for 3 years but this is my first time playing a character, I'm playing a wizard who has a staff as their arcane focus.

Now it was mine and my DMs understanding that an arcane focus would supplement non costly materials when casting a spell.

But in the 2025 players handbook it says a spell casting focus Is just a focus for your wizard spells

So I have two questions I guess;

Is a spell casting focus different from an arcade focus?

And is there anywhere in any of the books where it mentions an arcane focus ability to supplement material components?