"public_html" vs "www"

When logging into my account, I have two folders that do the same basically - have my site's files in them. What would be the primary difference between the two folders: public_html and www?

The reason I'm asking is that I accidently deleted my www folder - is that bad or very very bad? And I used to go into this folder when updating my site, however, it was sort of redirecting me to public-html folder either way.

I'm on CPanel, if that makes any difference and I use CuteFTP to manage files.

Any advice on what to do now?

Thank you.

 

 

 

 

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