What is the difference between packet and payload

Question

I got this defitiniton below is it true and what is the difference between packet and payload?

The ESP (Encapsulation Security Payload) protocol is a member of IPSec suite. Its purpose is to guarantee payload's (message) integrity, data origin authentication of IP packets and confidentially of the payload. It does provide protection for the entire packet, not only to the payload.

Answer 1

The answer is:

In tunnel mode it secures whole packet in transport mode does not.

Answer 2

A payload is the part of the packet with the actual info (the good stuff!) There are other parts of a packet, the packet headers, that describe the payload, like how big it is.

The description is telling you that protection is provided for everything in the packet, including it's headers. Hope that helps!