American educational children's series created by Joan Ganz…

American educational children's series created by Joan Ganz Cooney and Lloyd Morrisett, first broadcast on public television in 1969. Blending live action, cartoon animation and puppetry, it teaches letters, numbers and social skills through characters largely created by Jim Henson and his team, including Big Bird, Elmo, Bert and Ernie, Oscar the Grouch and the Cookie Monster. Adapted in many countries, it has won well over a hundred Emmy Awards.

The answer in 12 letters