# Unit 1: Basic Development (DS194) ## Front-End Development - **Front-end (client-side) development** builds the part of a website or app that users see and interact with in the browser. - **Back-end** handles servers, databases and logic; the front end communicates with it using **HTTP requests, APIs and JSON**. - The **three core technologies**: **HTML** (structure), **CSS** (presentation), **JavaScript** (behaviour). - UI developers work with designers to turn **mock-ups and prototypes** into responsive, accessible interfaces. | Layer | Technology | Role | Analogy | |---|---|---|---| | Structure | HTML | Content and elements | Skeleton | | Style | CSS | Layout, colour, fonts | Skin and clothes | | Behaviour | JavaScript | Interaction and logic | Muscles and nerves | ## HTML - **HyperText Markup Language**: markup language that uses **tags** to describe the structure and meaning of content. - Created by **Tim Berners-Lee**; current version **HTML5**. - Features: headings, paragraphs, links (``), images (``), lists, tables, forms, **semantic elements** (`

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