What is the difference between endangered animals vs threatened animals vs extinct animals?

Threatened means that the animal is vulnerable to extinction and the population of the animal is declining. (ex: Certain species of whale population are being threatened.)

Endangered means that the animal will soon be extinct if nothing is done about it. Some endangered animals are being bred in captivity until their numbers increase enough to be released back in the wild. (ex: Bald Eagles are an endangered species of bird. Pandas are an endangered species of bear.)

Extinct means that the animal has completely died out and there aren't any left of this species. (ex: Dinosaurs are an extinct species of reptile. Dodo is an extinct bird.)

Here's a visual:

Threatened-------------> Endangered---------------> Extinct