Android Terminal Emulator gives you a Linux-like terminal on your Android device. The Linux terminal is a powerful Linux tool that lets you access and manipulate files, as well as run commands, on a Linux computer. Xfce4-terminal, like GNOME terminal, is based on the Vte terminal widget library and is licensed under GPLv2. PuTTY is an xterm terminal emulator built into an SSH and telnet implementation for Windows and Unix platforms. Rxvt is a colour vt102 terminal emulator intended as an xterm(1) replacement for users who do not require features such as Tektronix 4014 emulation and toolkit-style configurability. The rxvt terminal is light on system resources and otherwise packe dwit.
Android Terminal Emulator is an application that lets you emulate the Linux operating system on your Android device, which means you'll be able to use Linux command lines. It's important to notice that this app doesn't emulate video games. Instead, it lets you access the Linux command line and execute them directly from your Android device.
This way, you can access your SD memory card and install and execute Linux commands. The application will let you modify different parameters such as color and size of fonts, the type of keyboard you want to use, and even the shell. You can also add widgets with direct access to your desktop. As mentioned by the application's developers, Android Terminal Emulator can't be used to root a device, nor can it be used to emulate any kind of video game. Android Terminal Emulator is not an application for everyone and is better for users who can use Linux fluently.