Background extinction: This is the slow, continuous disappearance of species due to environmental changes. It is a normal process that has been occurring throughout Earth's history.
Mass extinction: This is a sudden and rapid disappearance of a large number of species. Mass extinctions are usually caused by large-scale events, such as volcanic eruptions, asteroid impacts, or periods of intense climate change.
Human-caused extinction: This is the disappearance of species caused by human activities, such as habitat destruction, overhunting, and the introduction of invasive species.