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What is DNS? A computer engineer explains this foundational piece of the web – and why it’s the internet’s Achilles’ heel

Summary by The Conversation
Amazon Web Services, hosted in data centers like this one in Virginia, supports thousands of websites, apps and online services – but not during its recent DNS outage. Nathan Howard/Getty ImagesWhen millions of people suddenly couldn’t load familiar websites and apps during the Amazon Web Services, or AWS, outage on Oct. 20, 2025, the affected servers weren’t actually down. The problem was more fundamental – their names couldn’t be found. The cu…

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The Conversation broke the news in on Friday, October 31, 2025.
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