If you go by a certain name on the internet (for example, I go by Smartie), you may want to secure a username so nobody can impersonate you.
No... not yet! I'll implement it when I can get the code running on a 24/7 dedicated server.
Yes! Here is why.
In a database! Your details are sent straight to it.
For the username and display name? Yes. For the password? Haha, no. The password is encrypted before it's saved. Yay for crypto-security!