How can I get the customer's password in plain text/raw format if the customer as already registered and logged in in Magento 2?
Magento 2 keep
SHA2 encrypted password in
customer_entity table, if you still need to get password of customer after he is logged in, you can make an observer and get password in
If you define your problem in detail, there are some better ways to handle such scenarios.
you can refer to this link for further details how passwords are saved in magento.