C is the most popular language worldwide. Everything from microcontrollers to operating systems is written in C since it's very flexible and versatile, allowing maximum control with minimal commands and is a backend language, It forms (or is the basis for) the core of the modern languages Java and C++. It allows you access to the bare bones of your computer.
C is an imperative procedural language as it was designed to be compiled using a simple compiler. This means that it:
Provides low-level access to memory
Provides language constructs that map efficiently to machine instructions