What are the different deploy modes in Magento 2?

There are 4 different deploy modes in Magento 2. Default mode: Magento's default mode is an intermediate state between Production and Developer modes. While new files are generated, it happens only when a new asset is required by the front-end. In the default mode, no file can be generated more than once. you can deploy Magento applications on a single server. However, this mode is not optimized for production. Developer mode: Once this mode is enabled, all the files you save to pub/static/ (except for front-end errors) become the symlinks of the original file. This is not a recommended mode to keep an app in since it slows the page down. However, developers often use the mode for debugging, as it improves the efficiency of compilation and static loading. Production: During the production mode, all the files in pub/static are generated. As the name suggests, this is the best mode to use for all stages of application production. Maintenance: When you enable this mode, it will prevent access to the Magento website while your website is being updated or reconfigured.