Zend certified PHP/Magento developer

Successfully add new column and field for registration. But where does the data save for new field?

I successfully added new field for the registration form. But the problem I’m facing right now is where does the data save? In which table in database? I tried looking in the customer_entity but the data is not saved there. Any idea?enter image description here

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And here’s my code for the front end.

Magento_Customer/templates/additional.phtml