I wanted to know what this sort of distortion / artefact is called?

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3This is named moiré – Romeo Ninov Jun 19 '23 at 18:40
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@RomeoNinov Your comment is a completely correct answer. Can I ask why you didn't simply enter it as an "official" answer. It's not as if you are new here, or anything. – GrantRobertson Jun 19 '23 at 21:40
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@RomeoNinov thanks! Can you help me understand why this image would have moiré? – Riddhiman Dasgupta Jun 19 '23 at 23:42
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@RiddhimanDasgupta, did you read the Q/A (following the link)? – Romeo Ninov Jun 20 '23 at 04:09
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4It could be a photo of a computer display, rather than directly a photo of a bridge. – Tetsujin Jun 20 '23 at 07:13
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1@Tetsujin, IMHO you are correct. For me also it is visible this is photo of image on display :) – Romeo Ninov Jun 20 '23 at 07:20
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1@GrantRobertson https://photo.stackexchange.com/help/duplicates – osullic Jun 20 '23 at 09:13
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1A beneficial use of the moire produced when digitally imaging a screen. – Michael C Jun 20 '23 at 09:34