What is the definition of Index.html~?

Let's break down 'index.html~' like we're dissecting a bizarre alien artifact. 'Index.html~' is basically a digital instruction manual for your web browser, but with a dash of cryptic punctuation and maybe some extra punctuation marks that look like they're trying to communicate in a language only the internet knows. It's like the browser's equivalent of a secret handshake, but instead of handshakes, it's a series of asterisks and tilde symbols.

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Now, here's an unsettling example sentence using this peculiar HTML construct: "To log into your account, simply type 'index.html~' into the URL bar, but remember, this method may lead to unexpected side effects like a full browser shutdown and a cryptic error message that says 'Your password is...missing.'"