The term "endangered species" refers to any animal or plant species that is at risk of extinction due to changes in their habitat, climate, or human activities such as hunting, pollution or deforestation. To avoid repetition, there are different synonyms that can be used to refer to endangered species such as threatened species, vulnerable species, critically endangered species, or imperiled species. These terms are interchangeable and describe the same situation where a species is in danger of disappearing from the planet forever. It is essential to protect these species because they contribute to the biodiversity of our planet and play a vital role in maintaining ecosystem balance and resilience.