Wordpress How to Check whether it is POST or PAGE

Question

How to check if an article is a post or a page in WordPress?

Answer 1

You mean that is_single() will return true if it is a post ? (not a page), am I right,

I like that, I think you wrong, because I have a plugin show some text on only post, I'm using is_single() but It also show on pages.

Please advice.

Thanks