Final answer:
HTML, CSS, and JavaScript are essential for creating and styling interactive web pages.
Explanation:
The correct set of markup symbols or codes placed in a file intended to display on a web page is HTML. HTML stands for Hyper Text Markup Language and is the standard markup language for creating web pages.
CSS stands for Cascading Style Sheets and is used to style the layout of web pages. It is defined using tags like <style type="css"></style>.
JavaScript can be used to add interactivity to web pages. The correct syntax to write 'Hello World' in JavaScript is document.write("Hello World").
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