Answer
CSS units give numeric values a measurable meaning. • Absolute units include px, in, cm, mm, pt, and pc. • Relative units depend on fonts, viewports, containers, or other reference sizes. • Unitless numbers are valid only for properties that allow them.
💡 Simple Example
.page { max-width: 70rem; padding: 2vw; }
⚡ Quick Revision
CSS units express lengths relative to fixed or contextual references.