C is a very powerful and widely used language.
It is used in many scientific programming situations.
It forms (or is the basis for) the core of the modern languages Java and C++.
C++ is a very popular language for performance-critical applications that rely on speed and efficient memory management.
It’s used a wide range of industries including software and Game development, VR, Robotics, and scientific computing.
Visual Basic is a third-generation event-driven programming language first released by Microsoft in 1991.
It evolved from the earlier DOS version called BASIC. BASIC means Beginners' All-purpose Symbolic Instruction Code.
Since then Microsoft has released many versions of Visual Basic, from Visual Basic 1.0 to the final version Visual Basic 6.0. Visual Basic is a user-friendly programming language designed for beginners, and it enables anyone to develop GUI window applications easily.
COBOL stands for Common Business Oriented Language.
It is imperative, procedural, and object-oriented.
A compiler is a computer program that takes other computer programs written in a high-level (source) language and coverts them into another program, machine code, which the computer can understand.
COBOL takes data from a file or database, processes, and outputs it.
In short: COBOL takes data in, computes it, and outputs it afterwards.