Charles Darwin, a British scientist, laid the foundations in the 19th century for a modern theory of evolution that explains the origin of species and organisms by natural selection. Darwinism explains that the survival of species depends on their ability to adapt and evolve in order to survive. Natural selection acts exclusively on the preservation and accumulation of variations that are useful in the conditions to which the living being is exposed. It explains the concept of survival of the fittest and leads to changes in gene balance. The end result is that every creature strives to become better in relation to its living conditions. Also, with the development of genetics in the 20th century, animal husbandry was facilitated thanks to a number of great scientists and their discoveries. Selective breeding has led to genetically improved individuals and enabled higher production in the economy. The materials will include the use of comprehensive literature of experiments and observations by which he came up with the concept of the origin of species. A systematic overview of the tools and methods used by scientists of 19th century will explain the path to conclusions and discoveries presented to us by Charles Darwin.