The Google Video Quality Report shows the biology/mechanics of how the numerous YouTube videos travel from the internet to our eyes. Below are the screenshots I took while I was learning more on the subject, with a short description of the image attached.
Youtube has multiple servers for many videos, thus the closest server provides us the video we try to stream
Just like a car navigation system, Youtube transports the video data to our ISP with the highest efficiency achievable
This part denotes that data capacity and flow conditions must meet the standard to successfully carry video data to our home, through the internet service providers
This part delineates the fact that the power and capacity of the different ISPs may affect varying speed results in bringing the videos to individual homes or offices
This part highlights the idea that if an internet connection is congested, the speed of streaming will slow down significantly
The test results for my ISP, denoting Standard Definition, which means: "users on networks rated as Standard Definition should expect smooth playback on standard definition Youtube videos (360p) and may experience occasional interruptions on HD Youtube videos (720p and above)."
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