c - How to use fread correctly? -

i've seen 2 ways of providing size of file fread.

if lets have char array data, file pointer , filesize size of file in bytes first is:

fread(data, 1, filesize, file); 

and second:

fread(data, filesize, 1, file); 

my question is, there difference between 2 lines of code?
, line of code more "correct".

also, i'm assuming 1 in 2 lines of code means sizeof(char), correct?

argument 2: size of each member

argument 3: number of objects want read

now question:

is there difference between 2 lines of code?

fread(data, 1, filesize, file); 

reads filesize objects pointed data size of each object 1 byte. if less filesize bytes read, read partially.

fread(data, filesize, 1, file); 

reads 1 object pointed data size of object filesize bytes. if less filesize bytes available, none read.

do whatever requirement of program.