If you're using WordPress for a long time, you should have seen the error "Briefly Unavailable for Scheduled Maintenance" while loading your website.
It is most common for all WordPress users. If you are new to WordPress, and you have seen this error for the first time, then it may be confusing.
No need to worry about this. It is because of the maintenance mode. Maintenance mode is nothing but the WordPress update.
When you're updating your WordPress core files, plugins, and theme to the latest version, it will show the error like "Briefly unavailable for scheduled maintenance. Check back in a minute". It will be sorted once the update is completed.
