1. CIA Triad

Confidentiality:

Confidentiality means permitting authorized access to information while at the same time protecting it from improper disclosure.

Integrity:

Integrity is the property of information whereby it is recorded, used, and maintained in a way that ensures its completeness, accuracy, internal consistency, and usefulness for a stated purpose.

Availability

Availability means that systems and data are accessible at the time users need them.