HTML stands for HyperText Markup Language. It is the standard markup language used to create and structure content on the web. HTML describes the structure of a web page using a series of elements represented by tags.
CSS stands for Cascading Style Sheets. It is a stylesheet language used to describe the presentation of a document written in HTML. CSS controls the layout, colors, fonts, and overall visual appearance of web pages.
JavaScript is a versatile, high-level programming language that enables interactive and dynamic behavior on web pages. It can manipulate the DOM, handle events, make network requests, and much more. It is one of the core technologies of the World Wide Web alongside HTML and CSS.
Expand/collapse widgets (also known as accordions or disclosure widgets) help organize content in a compact way. They allow users to reveal information on demand, reducing visual clutter and making pages easier to scan. They are commonly used in FAQs, navigation menus, and settings panels.