Artificial and Synthetic

Artificial

Artificial means not natural or real. Something that is artificial is made by human beings, and it does not seem like something that would occur naturally, though sometimes might be made to look like a natural thing.
Ingrid tries to avoid using artificial sweeteners because she's concerned about the effect they could have on her health.
Campers should not set up lamps or strong flashlights on the beach because artificial light can disrupt the tortoises that come here to nest.
When used to describe people or human expressions, artificial means insincere. The expression artificial intelligence, or sometimes just AI, is used to refer to robots or generally to the branch of science that tries to engineer computers to act intelligently, either by imitating human intelligence or not.
Fred just strikes me as such an artificial person; he always has on a fake smile, and nothing he ever says to me ever seems sincere.
Although many advancements have been made in the field of artificial intelligence, scientists have yet to create a computer that can trick a human being into believing that it is human.

Synthetic

When used to describe an item, synthetic means that that thing does not occur naturally, but instead has been created through a chemical process.
Although some people prefer clothing made from natural materials, like cotton or wool, clothing made from synthetic materials might be better sometimes for being outdoors during extreme weather conditions.
Of course, getting enough vitamins through your diet is the best option. But if that is not possible, taking synthetic vitamins is better than nothing at all.
The noun synthesis refers to the process of creating something by combining two or more different things. Synthesis can be a chemical process, through which synthetic materials are made, but beyond the realm of science, it can be used to talk about any process in which different components are joined to form a unified whole.
In the history of agriculture, the synthesis of nitrogen and hydrogen to form ammonia is an important moment, because it allowed for more widespread fertilization of fields.
Many philosophers, like Kant and Hegel, have discussed the concept of synthesis, the combination of parts in order to form a more complete system, in their works.