What. Is purpose of p tag !

Answer 1

Your question is taged with 'php', so I suppose 'display a paragraph' answer of @Ahmed Al/malaji calls for a little more explanation about the context, because 'p tag' ( <p> tag ) is not a php keyword, but an html one. Html is a text language used to describe how to display web pages, and Php often serve dynamicly Html pages template based. <p> tag element is the tag used to describe a paragraph of text, in this context ^^

Answer 2

display a paragraph