CSS is a stylesheet language that describes the appearance and formatting of a document written in HTML or other markup languages. It allows developers to control how different elements on an HTML page are displayed without having to manually enter each style attribute. CSS allows developers to create complex sites with multiple page layouts, animations and transitions without having to write hundreds of lines of code. In addition, the use of CSS can help improve website performance by limiting the amount of HTML code required for each page.
CSS has become increasingly popular over the years due to its flexibility in design, allowing web pages to be more interactive and engaging than ever before. Its versatile nature allows designers to create unique visuals that make websites stand out from others on the web, while still providing an effective user experience for visitors. In addition, the use of pre-built frameworks such as Bootstrap or Foundation, which provide developers with ready-made templates to quickly create their own designs, has made it easier than ever for professionals and hobbyists alike to create stunning websites from scratch without the need for advanced programming skills or specialised software tools.