When it comes to web development, what is php, SQL and Ruby and perl? How do they all work together with web?

I am getting more and more into web development, and I have already mastered html, css, and javascript and a little ajaxs, but in my research I have found many other languages (sharks, perl, sql, ruby, php, and asp) I am not sure how they work together or the purpose of them. Please help thanks.

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