In some projects developers may face the problem of migrating the data from various other platforms to Magento 2: for example, the site may have previously worked on another CMS system, but we want to keep the already existing products, users and other entities in it. At the same time, when migrating users, we can migrate all the data to Magento except for password hashes, because they are encrypted differently in another system: use a different algorithm, another combination of salt and the password itself, etc.