C is often referred to as Middle-level Language and is correct in all terms. Because C Language kind of bridges or binds the gap between machine-level language or lower-level language and high-level language. And as we know, we can use C to not only do system-level programming but also, application-level programming.
If you wish to know more about C, check out the C tutorial, and if you wish to get certified in C, check out the C Programming course from reputed e-learning institute like Intellipaat.
Also, do take a look at our YouTube video on C Language for Beginners