Upstream and downstream network speeds usually refer to the direction of data transmission in a computer network. Typically, upstream and downstream Internet speeds are measured in bits per second (bps), or they can be expressed in larger units such as gigabits per second (Mbps) or megabits per second (Gbps).
Upstream speed is the speed at which data is sent to the Internet from the user's device (e.g., your computer, cell phone, etc.). For example, when you send an email, upload a file to cloud storage, or post social media content, it's the upstream Internet speed that's in play.
Downstream Internet speed is the speed at which data is transferred from the Internet to the user's device. For example, when you browse the web, watch a video, or download a file, it's the downstream internet speed that's at play.
The Internet speeds you may see advertised by your Internet service provider usually refer to downstream Internet speeds because download speeds are more important to the average user.
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