Alignment is the design principle of positioning elements so their edges or centers line up along a shared axis, creating a clean visual connection between them. It's one of the core building blocks of visual organization, alongside proximity and contrast.
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When elements are aligned, they read as related and intentional rather than random. Misaligned elements, on the other hand, can make a layout feel messy and harder to scan.

Why does Alignment matter?

Good alignment gives a layout structure and improves readability, since a viewer's eye can follow a clear line instead of jumping around the page. It also reinforces hierarchy, letting related items like a label and its input, or an icon and its text, appear as a single unit.

A simple example is left-aligning a block of body text and its heading along the same edge, or centering a modal's title, message, and buttons together. Designers typically use grids and guides to keep alignment consistent across a whole interface.

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