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CSS, in computer terminology, stands for Cascading Style Sheets. It is a style sheet language used for describing the presentation of a document written in a markup language like HTML or XML.

Here's a breakdown of its key aspects:

Styling and Presentation: CSS defines how HTML elements are displayed on a web page, controlling aspects such as colors, fonts, spacing, layout, and responsiveness for different devices and screen sizes.

Separation of Concerns: CSS promotes the separation of content (HTML) from presentation (CSS), making web pages easier to maintain, update, and achieve a consistent look across multiple pages.

Cascading Nature: The "Cascading" in CSS refers to how styles are applied. Multiple style sheets or rules can be applied to an element, and a specific hierarchy and set of rules determine which styles take precedence.

Rule-Based Language: CSS is a rule-based language where you define rules that specify which styles should be applied to particular elements or groups of elements on a web page. Each rule consists of a selector (to target HTML elements) and a declaration block containing property-value pairs (to define the styles).