Confidentiality - Integrity - Availability
Confidentiality
Confidentiality means some things need protection against unauthorised access. It can be anything ranging from financial transactions to bank records to medical records, tax returns etc. But It varies from person to person. For example, A Student might scream out of the class saying "I got an A", so he is ok exposing his grades to all but other student might not choose to reveal. Other things like order of military food might not seem confidential, but an sudden increase in the order could be the sign of an military conflict or war.
Integrity
Examples of Integrity failures are easy to find and too many. A number of years ago, Macro in a document added the word "not" after is in the statements after random instances. This might not appear integrity failure, but you can image the kind of havoc it can do if the word document consisted of Pentium computer chip details that produced an incorrect result due to the word "not" in a statement containing floating point arithmetic operation.
Availability
A computer users worst nightmare: You turn on your computer, but the computer does nothing. Your data and programs are not accessible, not available to you. This is quite common. Many of us do experience overload in service, access gets slower, computer responds but not in normal way.
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