Recombination is a biological process that occurs during the formation of reproductive cells, such as sperm and eggs. It involves the exchange of genetic material between paired chromosomes, leading to new combinations of genes. This process increases genetic diversity, which is essential for evolution and adaptation in populations. In humans, recombination typically happens during meiosis, a type of cell division that reduces the chromosome number by half. The resulting cells have unique genetic profiles, which contribute to the variation seen in traits among offspring. This variation is crucial for the survival of species in changing environments.