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Justification of file encoding and encoding in vim or elsewhere

I do not understand why VIM is there encodingas well fileencoding.

As far as I know, the file is like an array of bytes. When we create a text file, we create an array of characters (or characters) and encode this character array encoded with X into an array of bytes and save the byte array to disk. When reading in a text editor, it decodes an X-encoded byte array to restore the original character array and displays each character with a graph in accordance with the font. Only one encoding is involved in this process .

In VIM, set utf-8 encoding and file encoding , which tells the VIM wiki about working with unicode ,

encodes a set , as vim should represent characters inside . UTF-8 is required for most versions of Unicode.

fileencoding sets the encoding for a specific file (locally for the buffer)

" As vim should represent characters inside " against the " coding for a particular file " ... rewrites Unicode vs UTF-8? If so, why should the user worry about the first?

Any clues?

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