Extinction is the permanent loss of a species, meaning that no individuals of that species are left alive. This can happen for various reasons, including habitat destruction, climate change, and overhunting. When a species goes extinct, it can disrupt ecosystems, as every species plays a role in its environment. Many species, such as the Woolly Mammoth and the Dodo Bird, have already gone extinct. Conservation efforts aim to protect endangered species and prevent further extinctions. By preserving habitats and promoting biodiversity, we can help maintain the balance of ecosystems and support the survival of various species.