CSS, or Cascading Style Sheets, is a powerful language used to create and style webpages. It works by applying styling rules to elements on a page, such as headings or images, allowing developers to quickly create attractive websites without having to write extra code for each element. CSS also has the ability to control the layout of a page and create animations and transitions between different pages or sections of a website. By separating content from design, it helps make development more efficient, cost effective, and optimized for any device or screen size.
Overall, CSS is an essential part of modern web development, enabling developers to quickly create attractive websites without having too much extra coding involved. With its ability to control presentation across any device type or screen size as well as add animations and transitions between different pages or sections of a website, CSS has become an indispensable part of modern web development today.