how does a webpage or website submit an email address and hw is that info saved

Question

serious

Answer 1

If you are talking about form data saved, you can do it in many ways, but i know 2:
(1) Using Firebase Database
(2)Using PHP

Create a simple form as usual. Then in form, write:

<form action="data.php" method="post"></form>

In "data.php" (or any php file you created), you have to connect it to a database, like mysql eg.php myadmin. Then, when user submits the information, it is saved in the database for further usage, login etc.

Answer 2

Depends on what the backend is coded in. Are you talking about sending out e-mails?

The info is most likely safed within a database, depending on what you want to safe.

Answer 3

I can highly recommend phpmailer: https://github.com/PHPMailer/PHPMailer

This was my saving grace when i was using php to do this.