Asexual reproduction can be defined as the process by which offspring are produced from a single parent rather than through fertilization.
It is most common in environments that favor rapid population growth over genetic diversity, as the offspring inherits its genetic traits completely from one parent. The methods of asexual reproduction vary greatly among different types of species.
Some protozoans and many bacteria, plants and fungi reproduce via spores. Spores are structures naturally grown as part of an organism's life cycle and designed for separation from the organism and dispersal via a medium such as air or water.
When conditions are correct, the organism will release its spores, which are each then considered entirely separate and autonomous organisms. Given an environment suitable for life, the spores will then develop into fully grown organisms and eventually grow their own spores, repeating the cycle.
Prokaryotes and some protozoa reproduce via binary fission.