WordPress site maintenance is a series of tasks that ensure that your website is secure, glitch-free, and performing at optimal speeds for visitors. These tasks include taking backups, running malware scans, optimizing site SEO, and more

The WordPress maintenance mode page is something that is automatically shown to visitors temporarily when you make updates on your site, such as updating plugins, themes, or core. This is to keep from anything appearing broken or out of sync while files are being patched