sub f { print "got: ", @_, $/ }

my @a = qw( one two three );
my @b = qw( four five six );

## @a & @b will be flattened into a single list
f(@a, @b);

## pass references to keep array integrity
f(\@a, \@b);

## only @a is passed, so only @a is received
f(@a);

__output__

got: onetwothreefourfivesix
got: ARRAY(0x8107e50)ARRAY(0x8107f34)
got: onetwothree