Which command is used to run sudo commands without password

Command used to run sudo commands without password

NAME
     sudo - execute a command as another user

sudo allows a permitted user to execute a command as the superuser or another user, as specified by the security policy.

But here option s is used to run the privileged commands without password.

[nsk@testserver ~]$ sudo -s /etc/init.d/nslcd restart
Stopping nslcd:                                            [  OK  ]
Starting nslcd:                                              [  OK  ]
[nsk@testserver ~]$

Here,
-s [command] The -s (shell) option runs the shell specified by the SHELL environment variable if it is set or the shell as specified in the password database.  If a command is specified, it is passed to the shell for execution via the shell’s -c option.  If no command is specified, an interactive shell is executed.