Filesize
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The term filesize refers to how big a particular file is in terms of bytes.
Filesizes are expressed in terms of bytes, which are a unit of measure in the world of computers. A single byte is rather small, but most files are much larger. We express 1000 bytes as a kilobyte, and a million bytes as a megabyte
You can make an analogy with filesize to the weight of a physical object. Something that weighs 15 pounds obviously isn't as hard to lift as something that weights 15 tons. The same is true of filesizes, especially in an online context.A file that is 15 kilobytes takes much less computing power, and load on your internet connection, than a 15 megabyte file would.