In case of Server-Client paradigm, the terms “Upstream” and “Downstream” are used only with respect to the server. So basically "Upstream" means data coming to server (or me), "Downstream" means data leaving server (or me).
In a network, the terms upstream and downstream are used with respect to the position of the devices.
For instance, the flow of packets between three kinds of switches: access, distribution and core switches. The flow of packets from the access switches to the distribution and core switches is upstream. Whereas, from core level switches to access switches, the flow of packets is downstream traffic. With respect to distribution switches, the flow of packets to core switches is upstream traffic while the flow to access switches is downstream traffic.
So to make this a bit easier, for a giving device (app, or program), if data is coming to the device, then it is upstream. if data is leaving the device, then it is downstream.
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