Fortran What does the *4 mean in integer*4 in fortran77?

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How is
Code: 
integer*4
different from
Code: 
integer
?
 
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dimensionless said:
How is
Code: 
integer*4
different from
Code: 
integer
?

integer*4 is an expression where you multiply integer by 4?
 
Integer*1 => 1 byte integer variable
Integer*2 => 2 bytes integer variable
Integer*4 => 4 bytes integer variable
Integer => 4 bytes by default but can be compiler dependent
 

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