1. The XTerm program is the standard terminal emulator for the X Window System. It provides DEC VT102/VT220 and Tektronix 4014 compatible terminals for programs that can't use the window system directly. If the underlying operating system supports terminal resizing capabilities (for example, the SIGWINCH signal insystems derived from 4.3bsd), xterm will use the facilities to notify programs running in the window whenever it is resized. From Mandrake 9.0 RPM

2. X terminal emulator xterm is a terminal emulator for the X Window System. It provides DEC VT102 and Tektronix 4014 compatible terminals for programs that cannot use the window system directly. This version implements ISO/ANSI colors and most of the control sequences used by DEC VT220 terminals. From Debian 3.0r0 APT