HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of web documents using a system of tags and elements that tell web browsers how to display text and 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. It can update content, control multimedia, animate images, and much more. JavaScript is essential for creating dynamic and interactive user experiences on the web.
Responsive web design is an approach to web design that makes web pages render well on a variety of devices and window or screen sizes. It's a fundamental aspect of modern web development that ensures your website looks great whether accessed from a desktop, tablet, or mobile phone.