thumb|Charles Darwin in 1868
I cannot write the overview based solely on the context provided, as it only contains an image caption identifying Charles Darwin from 1868 and does not include any substantive information about Darwinism itself. To write an accurate overview, I would need contextual text that explains what Darwinism is and why it matters.
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thumb|Charles Darwin in 1868
Darwinism is a term used to describe a theory of biological evolution developed by the English naturalist Charles Darwin (1809–1882) and his contemporaries. The theory states that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce. Also called Darwinian theory, it originally included the broad concepts of transmutation of species or of evolution which gained general scientific acceptance after Darwin published On the Origin of Species in 1859, including concepts which predated Darwin's theories. English biologist Thomas Henry Huxley coined the term Darwinism in April 1860.
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