A general-purpose, high-level language, originally developed by Dennis M. Ritchie to develop the UNIX operating system at Bell Labs. This is one programming language without any expiry date. What makes it ideal for low level development is its closeness to the hardware, portability and usage of resource.
With it positive edge over other languages C is used as operating system kernels and embedded software.Major parts of Windows, Unix and Linux, Device drivers of new devices are still written in C as it provides you access to the basic elements of the computer. It allows you to manipulate and play with bits and bytes. Whenever it comes to performance (speed of execution), C is unbeatable.