This is known as the biological species concept. It's important to note that this definition has some limitations:

* It doesn't apply to organisms that reproduce asexually.

* It's difficult to apply to extinct organisms.

* There can be cases where two species can interbreed but produce infertile offspring.

Despite these limitations, the biological species concept is still widely used and accepted as a useful starting point for understanding species.

Here are some other concepts of species:

* Morphological species concept: Groups organisms based on their physical characteristics.

* Phylogenetic species concept: Defines a species as the smallest group of organisms that share a common ancestor and form a distinct evolutionary lineage.

* Ecological species concept: Focuses on the role of organisms within their ecosystem.

Ultimately, the best definition of a species depends on the context and the specific research question being asked.