Distinguishing lower case from upper case. In a case sensitive language, "abc" is considered different data than "ABC." Windows is not case sensitive, thus, "Abc" is the same as "aBc." However ...

That is, they could distinguish between files that were “spelled” identically, but used a different mix of upper-case and lower-case letters. In case-sensitive filesystems, file.txt, FILE.TXT ...

Google searches are NOT case sensitive. All letters, regardless of how you type them, will be understood as lower case. For example, searches for george washington, George Washington, and gEoRgE ...

Patrick Lambert considers the recent decision by Blizzard to ignore case-sensitivity in user passwords from the perspective of the security vs. convenience debate.