Who are the Defenders?

You might have seen that Marvel and Netflix just announced The Defenders. If you are not to sure sure about who they are or where they come from, Comics Explained did a nice job of talking about the history of the team

also, in case you missed it, here is the teaser for Marvel and Netflix on the The Defenders Show!

[youtube=://www.youtube.com/watch?v=wBZtM8q2Z1g&w=854&h=480]