CSS3 (Cascading Style Sheets) is a stylesheet language used to describe the look and formatting of a document written in HTML (Hypertext Markup Language). CSS3 is the latest version of CSS and includes a number of new features and capabilities that allow developers to create more sophisticated and interactive web designs. Some key features of CSS3 include:

  1. Selectors: CSS3 introduces a number of new selectors that allow developers to more precisely target elements on a page.
  2. Box model: CSS3 introduces new box model properties that allow developers to specify the dimensions and layout of elements on a page more accurately.
  3. Visual effects: CSS3 includes a number of new properties that allow developers to add visual effects to web pages, such as gradients, shadows, and transformations.
  4. Responsive design: CSS3 includes media queries, which allow developers to create designs that adapt to different screen sizes and resolutions, enabling the creation of responsive websites.
  5. Animation: CSS3 introduces new animation capabilities that allow developers to create smooth, interactive transitions and animations on web pages.
  6. Multiple column layout: CSS3 introduces new properties that allow developers to create multi-column layouts for text and other content.