C language is considered as the mother language of all the modern programming languages because most of the compilers, JVMs(Java Virtual Machines), Kernels, etc. are written in C language, and most of the programming languages follow C syntax, for example, C++, Java, C#,PHP, Javascript, Python.. etc.

It provides the core concepts like the array, strings, functions, file handling, etc. that are also being used in many languages like C++, Java, C#,PHP, Javascript, Python.. etc.

In Today's world as of 2020, Java, javascript and Python are the most demanding programming languages in IT industry, If you are good enough in C programming Language, it will be easy to learn  Java, javascript and Python, in addition it will be easy to enter into software industry by knowing  Java, Javascript and Python.