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The styling language that controls layout, color, spacing, typography, and responsive behavior on the web.
CSS decides how HTML looks and adapts across screen sizes. Tailwind, design systems, and component libraries still compile down to CSS rules. When text overlaps, buttons wrap badly, or mobile layout breaks, the fix is usually in CSS constraints, spacing, or responsive rules.
Plainly
Think of CSS as a named building block in a big LEGO app. The styling language that controls layout, color, spacing, typography, and responsive behavior on the web.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.