Security is when you protect data against unauthorized access. Security just ensures that data is accessible to authorized persons, it doesn’t aim to prevent those authorized persons from viewing your data or using it for other purposes.

Data privacy deals with the ability an organization or individual has to determine what data can be shared with third parties.

Security is about protecting data, whereas privacy is about protecting the identity of an individual. Both privacy and security over overlap in some respects as you need security to have privacy.