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Case Sensitive

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Caps lock key on keyboard
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Definition: Anything that is case sensitive discriminates between uppercase and lowercase letters.

Some examples of computer related data that is often times, but not always, case sensitive include commands, usernames, and passwords.

For example, if your Windows password is HappyApple$ you can not enter happyApple$ or HAPPYAPPLE$ because Windows passwords are case sensitive.

Note: If a command, program, etc. does not discriminate between uppercase and lowercase letters, it could be referred to as case insensitive though most of the time nothing at all is mentioned if there is no case sensitivity.

Examples:
"I couldn't understand why the command I was trying to run wasn't working until I realized that it was case sensitive and I was using all lowercase letters by mistake."

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