So “advise” is a verb and “advice” is a noun. I can advise you or give you advice, but I can’t advice you or give you advise.
Advise is spelled with an “s” but pronounced with a “z”. Advice is spelled with a “c” but pronounced with an “s”.
Then there’s “vice” and “vise” which have totally different meanings but are pronounced the same.
And we wonder why Japanese have trouble with English spelling.