Front-end development refers to the creation of the visual part of a web or mobile application with which users will interact. In this section, we will look at three technologies often used in front-end development:

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1 - HTML (HyperText Markup Language): a markup language used to organise a web page. HTML is used to create the page structure, links, text and images that make up a page.

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2 - CSS (Cascading Style Sheets): This language is used to add style to HTML pages. CSS modifies the elements of a web page to make it more visually appealing.

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3 - JavaScript (JS): programming language that makes HTML pages dynamic. It allows you to create intelligence on a web page and modify its behaviour. JS is one of the most popular languages and can be used to develop a wide range of projects.

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Finally, we're going to finish this section with introduction to Jquery. This javascript library simplifies several aspects of front-end development.