HTML (HyperText Markup Language) is the standard markup language used to create web pages. It provides the structure and content of websites by using a system of tags and elements that tell web browsers how to display text, images, links, and other media.
CSS (Cascading Style Sheets) is used to style and layout web pages — for example, to alter the font, color, size, and spacing of your content, split it into multiple columns, or add animations and other decorative features.
JavaScript is a programming language that enables interactive web pages and is an essential part of web applications. It allows you to implement complex features on web pages such as dynamic content updates, animated graphics, interactive maps, and much more.