TCP and Reliable Transport
TCP (Transmission Control Protocol) is a connection-oriented protocol used for reliable data transmission over a network. It provides a reliable transport service by ensuring that the data sent from the sender is received by the receiver without any errors or loss of data.

Acknowledgment in TCP
To achieve reliable transport in TCP, acknowledgment is used to check the safe and sound arrival of data. When data is sent from the sender to the receiver, the receiver sends an acknowledgment message to the sender to confirm that the data has been received without any errors.

Working of Acknowledgment in TCP
The working of acknowledgment in TCP can be explained as follows:

- When the sender sends data to the receiver, it waits for an acknowledgment message from the receiver.
- If the sender does not receive an acknowledgment message from the receiver within a certain time, it assumes that the data has been lost and retransmits the data.
- When the receiver receives the data, it sends an acknowledgment message to the sender indicating that the data has been received without any errors.
- The sender waits for the acknowledgment message from the receiver before sending the next packet of data.

Benefits of Acknowledgment in TCP
The use of acknowledgment in TCP provides several benefits, including:

- Ensuring reliable data transmission by detecting and recovering from errors or loss of data.
- Providing flow control by regulating the amount of data sent by the sender based on the receiver's ability to receive data.
- Preventing congestion in the network by avoiding the overloading of the network with too much data.

Conclusion
In conclusion, acknowledgment is an essential feature of TCP that helps to achieve reliable data transmission over a network. It ensures that the data sent from the sender is received by the receiver without any errors or loss of data by checking the safe and sound arrival of data.