What is "cash-sensitivity"

This concept generally applies to several languages and operating systems such as:

• C
• PHP
• XML
• Java
• C Sharp
• Linux commands

Example with java

String wikipedia = "";
String WiKiPedia = "";
String WIkipediA = "";

The variables wikipedia and wikipedia are distinct for the compiler in its processing. Case sensitive is also translated as box sensitive, as it appears in file systems that handle names written in high box, low box or combinations as various files. High box is an expression used in typography to refer to capital letters. It is the same as versais or capitals. Low box, in turn, corresponds to writing in lower case.