HTML comments aren't displayed on screen by the browser. They're used for leaving developer notes in the code — think of them as a sticky note that rescues future-you.
But don't put passwords, secret keys, or API keys in comments. The browser may not show them, but anyone viewing the source code can still see them.
html
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<section>
<h1>Welcome to ThutaTech</h1>
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Comments should stay invisible on the page and remain purely for code organization.