difference between '&subroutine()' and 'subroutine()'

[Jeff Pan]

HI,

I want to know what's the difference when I call a subroutine with '&'
 or without '&'.
such as:

&subroutine();
sub subroutine{
......
}

or

subroutine();
sub subroutine{
......
}

Can anyone tell me?thanks a lot.

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