It is a service that allows to consolidate security findings and alerts across accounts and provider products and display them into a single dashboard. (but only those that are generated after you enable Security Hub, it does not work retroactively).

It integrates with services like GuardDuty, Macie, Inspector and more.

https://cloudacademy.com/course/security-saa-c03/aws-security-hub-features/?context_id=7446&context_resource=lp

Security Hub also generates its own findings by running automated and continuous checks against the rules of three fundamental standards as defined by the Center for Internet Security (CIS):

CIS AWS Foundations

Payment Card Industry Data Security Standard (PCI DSS)

AWS Foundational Security Best Practices

We can't talk about security without talking about Encryption

encryption is the process of encoding information, converting the original representation of the information, known as plaintext, into an alternative form known as ciphertext, which ideally only authorised parties can decipher. source

Types of encryption: