Embedded Linux utilizes Linux kernel for an embedded device, but it is quite different from the standard Linux OS. Its application to embedded systems is motivated by the availability of device support, file-systems, network connectivity, and UI support. It is a customized version of Linux for embedded systems, consequently having a much smaller size and minimal features and requires less processing power. Based on embedded system requirements, the Linux kernel is modified and optimized. Such embedded Linux can only run device-specific purpose-built applications. The Real-Time Operating System (RTOS) with minimal code is used for such applications where least and fix processing time is required.