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Answer Posted / czarabid
In very simple terms "From any repo when we transfer the
data/bits then this repo will be called as upstream,
To any repo when we transfer the data/bit then this repo
will be called as downstream"
For instance consider SVN/GIT when we check in the source
code from it then it becomes downstream and when we make
changes to source code and check out then it is called as
upstream.
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