Your download speed is the rate at which you can receive media content. A higher download speed allows you to receive higher quality (larger) content. Upload speed doesn't have as drastic of an effect on your viewing experience, but a minumum upload rate is required to 'respond' to the server offering your video stream. Latency and Jitter refer to the time it takes for each communication between you and the server offering the stream.

Adobe Flash

Version: Flash 20.0 Beta

Release Date: Dec 8, 15

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Adobe Flash Player is a browser plugin used to stream and view video, audio and multimedia and Rich Internet Applications (RIA) on a computer or supported mobile device.

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Buffering occurs when the media you're viewing has played out faster than your device can download it, causing it to stop and wait for the next chunk of data to become available.

Buffering is an issue specific to your internet connection, and not the speed or capability of the device you're viewing on.