When u upload video on YT, it is compressed and stored on servers. Server is filed with hard drives, where video is stored. 1 server can hold how knows how many TB of storage. For example lets say 1000tb per server, imagine whole buildings filled only with servers (10.000 servers times 1000tb) it comes to allot of memory. Imagine that on scale of who knows how many servers in the world and there is your answer hehe
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