Other people have given very good answers but I should note that not all the dinosaurs died and that certain lineages survived and are now what we call birds. You’ll often hear people try to say that birds aren’t dinosaurs but are DESCENDANTS of dinosaurs, but that distinction is totally meaningless in biology.
Just like you, a human being, are a member of the Great Apes which are members of the primates which are members of the mammals, birds are members of the maniraptorans which are members of the theropods which are members of the dinosaurs.
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