What is "Cloning" a hard drive?

Can someone tell me what it means to clone my hard drive?
Why would I want to clone it?
Thanks!

I use SuperDuper rather than CCC, but I think CCC allows you to opt for an incremental update of your clone each time you run CCC. Whatever files have been changed since the last time will replace the older copies of themselves on the clone, and whatever files have been newly created since then will be added to the clone. So if the drive on which you create your clone is the same size as the source drive, you'll never run out of space on it until you also outgrow the source drive.
You should clone your primary drive whenever you've saved anything on it that you can't afford to lose, and that isn't backed up anywhere else. I back up just the important new work I've done each day on a USB flash drive, and I update the clone of my whole internal hard drive every week or two using SuperDuper's incremental update function. All those new and changed files are temporarily backed up on the flash drive immediately after I work on them, and more permanently backed up in my clone at longer intervals.

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