What are pseudo-tty devices?

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http://www.linuxquestions.org – What are pseudo-tty devices? can any body guide me guide or tutorial where all the devices are listed with their use? The reason for posting the thread is i m doing server hardening .It is not recommended to include pseudo-tty devices in /etc/securetty file . Following are the statement from hardening guide. Quote: This file should only contain locally attached console devices, and must not contain any pseudo-tty devices Correct me if i m wrong. locally attached console devices which are normally determined using w command. For example . These ttys can be (HowTos)