Linux (pronounced LIN-UKS) is a UNIX-based operating
system that runs on a number of computer platforms,
including PCs, servers, and handheld devices.Android, which is a widely used operating 
system for mobile devices, is built on top of the Linux kernel.Linux also runs on embedded systems, which are devices whose operating system is 
typically built into the firmware and is highly tailored to the system; this includes 
mobile phones, tablet computers, network routers, facility automation controls, 
televisions, and video game consoles.