Magento 2: cache clean vs cache flush
During the development we constantly use the Magento feature to clean or flush the cache, but do you know the difference? Check out this difference based on DevDoc.
php bin/magento cache:clean
Cleaning a cache type deletes all items from enabled Magento cache types only. In other words, this option does not affect other processes or applications because it cleans only the cache that Magento uses.
Disabled cache types are not cleaned.
php bin/magento cache:flush
Flushing a cache type purges the cache storage, which might affect other processes applications that are using the same storage.
Reference: DevDocs Manage the cache