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What is evolution?

Dear student,
Evolution can be defined as a continuous change in organisms over generations which is responsible for diversity of organisms at every level of biological organisation. It is a slow process of formation of growth and development of an organism. These changes help in the accumulation of desirable characters  over generations which helps to survive in the surrounding environment.
There are many theories that explain evolution in different ways out of which Darwin's Natural selection states : the organisms having particular traits that helps them in adjusting to the surrounding environment can only survive (SURVIVAL OF THE FITTEST) and perpetuate those traits to the succeeding generations.

hope you have understood,
regards

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Evolution is the changes in characteristics of an organism over successive generations.
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The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring. 

Evolution by natural selection is one of the best substantiated theories in the history of science, supported by evidence from a wide variety of scientific disciplines, including paleontology, geology, genetics and developmental biology.
The theory is sometimes described as "survival of the fittest," but that can be misleading, Pobiner said. Here, "fitness" refers not to an organism's strength or athletic ability, but rather the ability to survive and reproduce.
Regards !
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It is defined as the process by which different kinds of living organism are believed to have developed from earlier forms during the history of the earth.
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the development of plants, animals, etc. over many thousands of years from simple early forms to more advanced ones
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