Think about the path between sender and receiver as a pipe.
You will have data inside de pipe all the time, the amount of it is a product of bandwidth an latency (pipe length), which is measured as RTT (round-trip time).
The sender puts data on the pipe and must wait for acknowledgment from the receiver. How much data should it put on the pipe before the first acknowledgement arrives?
If the pipe is too length, the sender will have a lot of data on transit, but this amount will grow over time based on some algorithms (congestion control).
You will have data inside de pipe all the time, the amount of it is a product of bandwidth an latency (pipe length), which is measured as RTT (round-trip time).
The sender puts data on the pipe and must wait for acknowledgment from the receiver. How much data should it put on the pipe before the first acknowledgement arrives?
If the pipe is too length, the sender will have a lot of data on transit, but this amount will grow over time based on some algorithms (congestion control).