The part of a script where a variable is accessible after it is declared is its scope. Not always a variable could be accessed after it’s been declared in the remaining part of the script. The location of declaration determines Read more
If a variable is meant to be contain a value that may change, then, a constant is meant to be contain a value that never change.
Variable is a memorable name of computer memory cell(s) that can hold a value during the execution of the program and the value may change.