Unix is a multi-user operating system that requires every
user to first login, to gain computer or system access.
So, when you first turn on your computer, you will see a login:
prompt. Now enter your username, which you will see being echoed on
the screen as you type. After you've typed your name, hit the Return key.
Next, you will be asked to type your password next to the
password: prompt. You will notice that this time as you
enter your password it will not be echoed to the screen. This is for
your own protection, and will keep anybody who may be lurking behind
you from discovering your password.