The Terminal application ( /Applications/Utilities ) is Mac OS X's graphical terminal emulator. Inside the Terminal, Unix users will find a familiar command-line environment. In this chapter we describe Terminal's capabilities and compare them to the corresponding xterm functionality when appropriate. We also highlight key features of two alternative Aqua-native terminal applications, GLterm and iTerm. The chapter concludes with a synopsis of the shell command, open , which you can use to launch GUI applications.