A 1 GB file downloaded from the Internet will have around ~ 53 MB of additional (invisible) data
This data is not part of the actual file, nor we can see it anywhere once the download is completed.Simply put, this additional data is called communication overhead, an essential component which contains all control information required for the file to travel the vast computer networks.
So what's the concern? Especially given the fast Internet connections and unlimited data plans we have?
Well, what if the download file size is 10 GB? Now the new overhead unavoidably increases to not less than ~534 MB.