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PHP 7.3 reached end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in September 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.
The Magento_Customer module serves to handle the customer data (Customer, Customer Address and Customer Group entities) both in the admin panel and the storefront.
For customer passwords, the module implements upgrading hashes.