Here's what the buttons do: Sounds cool, can I get that? Scalable and Secure Terminal Emulation Comprehensive terminal emulation at lower cost Rocket® BlueZone® provides a fast, cost-efficient way to access terminal-based applications from desktops, web, or mobile devices. Termux is described as 'A terminal emulator and Unix environment bringing powerful terminal access to your Android-powered devices' and is an app in the OS & Utilities category.
