CSS

CSS, or Cascading Style Sheets, is a style sheet language used to define the look and feel of web pages. It is used by web developers to create consistent user interfaces (UI) and user experiences (UX), as well as to give web pages a distinctive design and animation. It can be used to control the layout of text, images, colors, fonts, and other visual elements. 

CSS also makes it possible to create responsive web designs, meaning the page will look great on any device. CSS is also used to create brand identities, as it allows developers to use custom fonts, colors, and images. All of these features make CSS an essential tool for any web developer. With CSS, you can create a well-designed, responsive, and branded web page that is easy to use and looks great.