How are extinct animals different from endangered animals?

extinction is the death of every member of a species or group of taxa (A taxonplural:taxa) or taxonomic unit is a name designating an organism or a group of organisms). A species becomes extinct when the last existing member of that species dies. Extinction therefore becomes a certainty when there are no surviving individuals that are able to reproduce and create a new generation.A species may become functionally extinct when only a handful of individuals survive, which are unable to reproduce due to poor health, age, sparse distribution over a large range, a lack of individuals of both sexes(in sexually reproducing species),or other reason.

An endangered species is a population of an organism which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters.