CIA Triad

The CIA triad represents the three pillars of information security: confidentiality, integrity, and availability, as follows.

Confidentiality – preserving authorized restrictions on information access and disclosure, including means for protecting personal privacy and proprietary information

Integrity – guarding against improper information modification or destruction and ensuring information non-repudiation and authenticity

Availability – ensuring timely and reliable access to and use of information

Source: https://www.nccoe.nist.gov/publication/1800-26/VolA/index.html