C has been called a “portable assembler” and is used for low-level programming that can be compiled with different compilers. C’s efficiency makes it easy to write efficient code, which in turn improves runtime performance. Its versatility enables programmers to take advantage of many libraries like OpenCV (computer vision), SQLite (database management system), and GTK+ (windowing toolkit).
The fact that the language originated as an implementation language also gives these advantages: it was designed by experts who had experience writing programs on their own machines; because there are no pointers or other abstract concepts involved, you don’t have to worry about ever getting memory allocation wrong; and lastly, its simplicity leaves room for optimization opportunities.