The payload section of the TCP segments contains the actual data being transmitted.
It includes application data such as web pages, emails, and other types of files. This is the portion of the packet that is delivered to its intended recipient. The size of this segment can vary depending on the amount of data being sent between two computers.
Additionally, some protocols incorporate data into the payload section that is necessary for communication between two computers, such as sequence numbers and other flags. The payload section can also include additional error-checking codes to make sure data is received correctly.
It is important to note that in most cases, the size of a packet is limited by the Maximum Segment Size (MSS), which is set by the sender. This helps ensure that a packet does not become too large and cause network performance issues.