@_ and $_ in Perl

1.@_ is an array of parameters that are placed when a function is passed, and you can take arguments from it,
such as my ($para 1, $para 2 ...) =@_, when a function call is filled with several parameters, it is possible to take several parameters from the array.
2.$_ is the default parameter, which refers to the last variable that the program handles without specifying it, such as
open (in, "<file.txt") while
(<IN>)
{
   print $ _;
}
Close (in);

This example opens a text file, reads each line, and, without specifying a parameter, $_ points to each line read from the file.

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