Piggybacking is a technique used for efficient utilization of bandwidth. The acknowledgment for previous segment is sent along with the data request/transfer of current segment.

piggybacking is a ack .it is very simple and short msg 4 ack ,it does not contain any type of information .so it will take very less bandwidth.

piggybacking is used for flow control

these all will comes n transport layer.
Acknowledge is giving confirmation to sender that the receiver got the data which is sent by sender.

while sending the data, the data will change to frames an bits.so each frame and bits have sequence number to rearrange the data when the receiver receives the data.

Flow control is avoids the problem of a host at one side of the connection overflowing the buffers in the host at other side. Ensures the integrity of the data.

Re-transmission is nothing but sending the data again if the data is lost

Piggy backing is a technique used to improve the efficiency of bi-directional protocol.when a frame is carrying data from A to B,it can also carry control information about arrived frames from B and while carrying from B to A,can carry information from A

Piggybacking is a bi-directional data transmission technique in the network layer (OSI model)
instead of sending an acknowledgement in an individual frame it is piggy-backed on the data frame.
Piggybacking data transfer is a bit different from Sliding Window Protocol used in the OSI model.

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