An Ignite Talk is a short presentation on a specific topic. You will have 5 minutes to pitch a certain idea, a project you started or anything else you deeply care about. Normally it would be used to call for action, to search for people to join the project or to just get the word out.
If you hold a 5-minute Ignite Talk at re:publica you will be featured on our website and get a video recording of your talk. However you won't get a free ticket for the conference.