<p>Sometimes a store may need to work and upgrade the site in a period. For example, you may want to build new themes, fix the site problem, or add new plugins that change the behavior of your sites. During the adjustment stage, your website may seem broken to the visitors. If you have a lot of traffic, then it is best to prevent customers from seeing the maintained sites. It will create a bad user experience and makes people feel your brand is unprofessional.</p>
source https://www.mageplaza.com/blog/custom-maintenance-mode-page-in-magento-2.html
source https://www.mageplaza.com/blog/custom-maintenance-mode-page-in-magento-2.html
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