What is Security and Privacy?

Keeping a system and its data safe from people who should not have access is called security. Making sure personal information is seen and used only by the right people, for the right reasons, is called privacy. The two ideas travel together: security protects the system, and privacy protects the people whose data lives inside it.

Think of a bank. Security is the vault, the locks, and the guards. Privacy is the rule that a teller may look at your balance only while serving you. A bank needs both, and so does your system.