WORDPRESS RELIABILITY GLOSSARY
Must-Use Plugin (mu-plugin)
A high-priority script in wp-content/mu-plugins that runs automatically before standard plugins.
Plain-English Explanation
A special, un-deactivatable background tool that starts before anything else to protect and monitor your website.
Systems Engineering Definition
PHP scripts residing in wp-content/mu-plugins/ that are executed automatically by the WordPress kernel in alphabetical order before normal plugins or themes load.
Common Root Causes
- •Regular plugins can be deactivated from the admin dashboard; mu-plugins cannot be deactivated or deleted via the UI
- •Ideal for hosting-level telemetry, security wrappers, and error trapping routines
Autvy Automated Remediation
Autvy operates as a lightweight mu-plugin, guaranteeing that even if all normal plugins crash or the admin dashboard is down, Autvy remains active to protect your site.
Related Terms
Automate protection against Must-Use Plugin (mu-plugin)
Free 100-site private beta with instant remediation.