What is CSS primarily used for?

CSS, or Cascading Style Sheets, is fundamentally utilized for styling and laying out web pages. It allows developers to define the look and feel of a website by controlling elements such as colors, fonts, spacing, and overall layout. By applying CSS, designers can enhance the visual presentation of HTML content, creating a more engaging user experience.

While CSS can influence some interactive elements, it does not create them; that role is served by client-side scripting languages like JavaScript. CSS also does not involve server-side interactions, data manipulation, or database connections, which are tasks handled by back-end technologies. Therefore, styling and layout remain the primary focus and capability of CSS, reinforcing why this choice is correct.