The point is that each of us are programmers. Add the ability to write in a programming language and you'll find your website has even greater potential. Most scripts have some sort of default configuration to go by. Whether it's the path to a file or value within a variable. Usually these configuration areas are editable giving you greater control over their actions.
Configurations work the same way.
Welcome to the wonderful world of variables. Variables are defined as being structures that holds data and is uniquely named by the programmer. It holds the data assigned to it until a new value is assigned or the program is finished. Variables are used to hold control values. A local variable is one that is referenced only within the subprogram, function or procedure it was defined in.