When you make a form, where does the information go after someone fills it out?

Question

if you make a form for them does it go to another hidden page just for the web page owner so they can see I out? What about passwords and user names? like Facebook and Netflix. how do those websites understand when to log someone in? does it have to be an email?

Answer 1

Carrie
I also confuse with these things before. but recently I start learning PHP and I also make a small project using php+database. The link is below:
http://aman12oct98.000webhostapp.com

Answer 2

if you don't specify where the entered information goes to (can be sent as an email or stored in a database) it gets lost, I.e. nothing happens.

the "login forms/pages" compare the entered data with database entries. and no, it doesn't "have to" be emails. it can be anything you want.