The seminar “Introduction to the C Programming Language” is organized by the specialized high-tech company Digital Academy created by the Group of Lecturers of the NTUA Multimedia Technology Laboratory. C programming language is the most widely used language worldwide. It was created at least 30 years ago and has proven its great strength and excellent performance over time. It is a programming language, which is at the same time very close to the computing machine and the human mentality. A good understanding of C paves the way to quickly understanding and becoming familiar with most, if not all, programming languages. Moreover, it is the basis and starting point for the rest of the mainstream programming languages, such as C++, C#, Java, MATLAB, etc.