In biology, a niche refers to the role that a species plays in its environment, including all of the environmental factors and interspecies relationships that influence the species. Each species has a different set of adaptations, so they do not directly compete for all the same resources as other species. Instead, they have their own niche, which allows for lots of different species to coexist because they occupy different niches. A niche may be influenced by biotic and abiotic factors of an ecosystem, and it particularly describes the relational position of an organism or a population in a particular ecosystem.

There are different types of niches, including:

• Fundamental Niche: The total range of environmental conditions that a species can potentially occupy.
• Realized Niche: The actual amount of resources or environmental conditions that an organism is able to utilize within an ecosystem.

It can be advantageous for an organism to occupy a very specific niche, as this way they will encounter less interspecific competition. Such organisms are called niche specialists. However, specialist species that occupy a very narrow or highly specialized niche encounter problems when there is a sudden decline or change in biotic or abiotic factors; if the organism is unable to adapt to the change, it becomes highly vulnerable to population decrease or extinction.

In summary, a niche is all about a single species as a part of the habitat with all its biological activities as influenced by biotic and abiotic factors.