CSS uses various units like pixels, em, rem, percentages, characters, viewport, and container units to define an element's dimensions. Units determine how elements (e.g., height, width, font size, margin) are sized on a page, providing essential context for browsers to apply numbers to elements.
Numbers in CSS can be classified into integers (unit-less), decimals, dimensions (integers or decimals with units like rem), and ratios. While they are all numbers, the distinctions help understand how different units affect them.
CSS numbers can be categorized as absolute or relative units. Absolute units, like Bill Murray in Groundhog Day, always maintain the same value regardless of other elements' sizes, ensuring consistent rendering.
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