What is the difference between congested window CWND and sliding window in TCP?

sliding window follows sliding window protocol
congested window CWND is the window size of the sender, and follows AIDM (additive window addition, multiplicative window reduction)
so what"s the difference between the two windows?
my understanding is that the sliding window size is the minimum of both CWND and RWND?
where RWND is the acceptable size of the receiver buffer, is the understanding of
correct?

May.15,2021
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