This principle that applies to good user experiences driven by equally good UI design: the degree of quality is determined by the ratio of relevant information (signal) to irrelevant information (noise) that appears in the UI. Noise reduces clarity, usability and value; it dilutes useful information with useless information.
Noise is visual clutter that we identify on a page in a blink, It can be text or image. If we are leaving this clutter(Noise) on-page, every component will look like fighting to another component on a page. Every component will be a mismatch. And design in itself will start looking like noise or clutter. This majorly comes from more content and fewer media or more media or less content on a page. Some over or under-designed components on a page (no matter how small)
Small things like component sizing or even linear fonts which are not maintained can cause serious noise on a page.
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Showing Value-driven features.
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Unnecessary media and labels overload
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Color schemes.
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Responsive.
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Component-based designing
**material derived in part from Ali Torbati's Reducing Visual Noise for a Better User Experience