An artificial sweetener is just any substance that *tastes* sweet but contain few or no calories. There are a bunch of different ones. As you noted, some are derived from plants, and some are artificially created chemicals. Stevia is a common artificial sweetener that comes from a plant called *Stevia rebaudiana*. Another very common one is aspartame. Aspartame is a chemical that’s made in a lab. There are many more – too many to list. The Wikipedia page for sugar substitutes has a good breakdown of the various types of artificial sweeteners and a list of carious examples.
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