Clone
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"'Cause every chromosome is a hand-me-down"
- – Weird Al Yankovic, "I think I'm a Clone Now"
A Clone is an organism created from the same genetic information from another organism. Clone comes from the Greek word for "twig", as you can clone a lot of plants by cutting off a branch or a leaf and planting it. This is done extensively in certain fields of agriculture, though it has it's problems relating to disease vulnerabilities (see the Irish Potato Famine or Gros Michel Bananas). Some animals also reproduce via cloning, with females making identical twins of themselves.
But as a general rule, when people talk about cloning they talk more about human clones by artificial means, taking a gene sample, fertilizing an egg and growing it to maturity usually in some form of Exowomb.
Star Wars: Clone Troopers
Probably the most significant mention of clones for the Star Wars franchise is the existence of the Clone Army during the age of the Republic. Created by the Kaminoans using the genetic information of the bounty hunter Jango Fett, this Clone Army was the main battleforce that the Republic relied upon, as each soldier was able to become trained warriors within a mere decade. Each one was also conditioned to be less independent, which meant that there was no concern about betrayal by some outside force hijacking them...yeeaaaahhh, about that...
While the clones as an overall force was controlled by the Empire, they were eventually phased out and replaced by the Stormtroopers for multiple reasons, the most significant being the fact that Jango's death meant that they had lost access to his genetics in order to continue making clones. Also concerning was the fact that clones tended to adhere strictly to protocol when not guided to think freely by a commanding officer, which made them question their tactical capabilities when compared to merely hypno-indoctrinating normal people.
Clones in 40K
Cloning tech was apparently around in the Dark Age of Technology, but has been largely lost to the modern Imperium. There are apparently some forms of cloning tech still around, but those who have them keep them intensely secret. The Death Korps of Krieg are widely rumored to use some form of cloning tech to mass-produce their suicidal martyr-soldiers.
The Leagues of Votann are an entire society made up of clones and androids working together in harmony, something they know they had better damn well keep out of the knowledge of the Adeptus Mechanicus.
Clones in D&D
Magic can be used to create clones in Dungeons & Dragons, with the most famous example being the singular high level spell literally titled Clone.
Clones in Metamorphosis Alpha
Clones were introduced to Metamorphosis Alpha as an optional... race? Background? In issue #6 of Dragon Magazine - hey, this is an old game! Long story short, the Warden was outfitted with a protocol called "Clone Bank Alpha", where if a catastrophe seriously impacted the ship's available stockpile of a specific worker caste so that the generation ship couldn't handle replacing them in the standard way of "have kids and train them to take over", then this specialized bioengineering bay would churn out-rapidly grown clones artifically implanted with the knowledge they need to do their jobs, thus replacing the casualties quick and easy. Unfortunately, the Warden's designers never considered that the ship might be hit with a disaster so severe it not only caused the necessary casualties, but also knocked the damn clone bank offline... sure enough, guess what happened? And, of course, by the time the repair bots accidentally manage to fix things enough that they inadvertently turn it back on, the clone bank is as decayed as everything else on the ship, resulting in errors ranging from incomplete knowledge uploads to rampant genetic mutation. So the clones aren't that much better off than their techno-barbarian mutant descendants.