Describe the concept of scope and variable visibility in Perl.

In Perl, scope refers to the visibility and lifetime of variables within a program. It determines where and for how long a variable can be accessed. Understanding scope and variable visibility is crucial for writing reliable and maintainable Perl code. Let's dive into the concept of scope in Perl: 1. Global Scope: * Variables declared outside of any subroutine or block have global scope. * Global variables are accessible from anywhere in the program. * They retain their values throughout the entire execution of the program. * Example: ``` perl`my $global_var = 10; sub foo { print $global_var; # Can access global variable }` ``` 2. Lexical (or Private) Scope: * Variables declared within a block, such as a subroutine or loop, have lexical scope. * Lexical variables are accessible only within the block where they are declared. * They are created when the block....