HTML (HyperText Markup Language) is the standard language for structuring web pages. It uses elements like headings, paragraphs, images, and links to build webpages.

CSS (Cascading Style Sheets) is used for styling web pages. It controls colors, layouts, fonts, and animations, making websites visually appealing and responsive.

JavaScript is a programming language that adds interactivity to web pages. It enables features like animations, form validation, sliders, and much more.

Accordions help in organizing content efficiently, improve user experience by reducing clutter, and allow users to interact with only the relevant sections.

To make a website interactive, use JavaScript with libraries like jQuery or frameworks like React. CSS animations and transitions also enhance interactivity.