A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour, or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet. For example, Boa constrictor is one of the species of the genus Boa, with constrictor being the species' epithet.

ಜೀವಶಾಸ್ತ್ರದಲ್ಲಿ ಪ್ರಭೇದ ಎಂದರೆ:

• ಒಂದು ವರ್ಗೀಕರಣ ಶ್ರೇಣಿ ಎಂದು ಅಥವಾ
• ಆ ಶ್ರೇಣಿಯಲ್ಲಿನ ಒಂದು ಭಾಗ "ಪ್ರಭೇದ" ಎಂದರ್ಥ. ಇದನ್ನು ಕೆಲವು ಬಾರಿ "spec." ಅಥವಾ "sp." ಏಕವಚನ, ಅಥವಾ "spp." ಬಹುವಚನ ) ಎಂದು ಸಂಕ್ಷೇಪಿಸಲಾಗುತ್ತದೆ.