1. Portability = It refers to the ability of a program to run in different environments. Different environments could refer to different computers, operating systems, or different compilers. Since, C compilers are available for almost all systems; C can be termed as the most portable language.
2. Flexibility = C combines the convenience and portable nature of a high-level language with the flexibility of a low-level language.
3. Wide Acceptability = C is a language known to an overwhelming majority of programmers around the world. The language is suitable for projects both at the system-level and at the application level.

C has now become a widely used professional language for various reasons.
•    It has high-level constructs.
•    It can handle low-level activities.
•    It produces efficient programs.
•    It can be compiled on a variety of computers.