Why does the file type not change when converting a .PDF to a .PNG?

Question

I was watching a video where the narrator stated that changing a file type from .PDF to .PNG doesn’t change the actual file type of the document. Could anyone explain why ?

In: 2

Answer 1

Say you own a book, “Alice in Wonderland”. You’ve read it and enjoyed it. Now you want to read “Through the Looking Glass”. Would simply scratching out the title of the book you own and writing “through the looking glass” on it change the contents of the book?

The file type is a NAMING convention. This is simply a general rule how to write titles for the file. It has nothing to do with the contents of the file.