Learn and Master C Programming - Understanding 'extern' keyword in C

The video tutorial explains the concept of the external storage class in C programming, focusing on the use of the 'extern' keyword. It describes how external variables are defined outside any function block and can be accessed globally across different source files within the same project. The tutorial provides an example with two files, demonstrating how to declare and use an external variable. It also covers the importance of declaring a global variable once in the project and how the compiler treats separate files as distinct compilation units. The tutorial concludes with a summary and a preview of the next lecture, which will involve practical implementation in Visual Studio.

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