What is Ted talk?

Introduction:
A TEDx Talk is a showcase for speakers presenting great, well-formed ideas in under 18 minutes.
Why under 18 minutes?
This short talk model works, since it only demands the audience's attention for a short period of time, decreasing the chance of minds wandering or daydreaming about lunch. In fact, some of greatest TED Talks have been as short as 5 minutes long.
What is a great, well formed idea?
- Something that’s new and surprising; an idea or invention that your audience has never heard about.
- A great basic idea (that your audience has maybe already heard) with a compelling new argument behind it that challenges beliefs and perspectives.