An unexpected idea which improves the lives of many people, results in significant positive changes or brings abundant joy and pleasure. The idea could have already been done in the past, the present, or soon to be in the future.
The x in the UnexpecTED Theme implies that the idea could be in any field such as technology, energy, humanity, arts, culture, or basic needs. Stretch your imagination.
The TED or TEDx Talk is about ideas worth spreading:
In the spirit of ideas worth spreading, TED has created a program called TEDx. TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. Our event is called TEDxIIT, where x = independently organized TED event. At our TEDxIIT event, TEDTalks video and live speakers will combine to spark deep discussion and connection in a small group. The TED Conference provides general guidance for the TEDx program, but individual TEDx events, including ours, are self-organized.