Why am I seeing a 503 error when the website is usually fine?

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Grade: Education Subject: Support
Why am I seeing a 503 error when the website is usually fine?
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The website might be experiencing a sudden surge in traffic, a scheduled maintenance window, or a temporary issue with a backend service it relies on. It could also be a problem with the server's resources (CPU, memory) being exhausted. The issue is usually temporary and resolves itself.