What is the root cause of a fatal error 'allowed memory size exhausted' in WordPress?

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Grade: Education Subject: Support
What is the root cause of a fatal error 'allowed memory size exhausted' in WordPress?
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The fatal error 'allowed memory size exhausted' in WordPress indicates that the server is running out of available memory. This often happens when a large number of plugins, themes, or media assets are loaded simultaneously, or when the database is heavily utilized. It's a common issue related to WordPress's resource management.