Difference between pts and tty

> **Possible Duplicate:** > [What is the exact difference between a 'terminal', a 'shell', a 'tty' and a 'console'?](https://unix.stackexchange.com/questions/4126/what-is-the-exact-difference-between-a-terminal-a-shell-a-tty-and-a-cons) I always see pts and tty when I use the who command but I never understand how they are different? Can somebody please explain me this?