What is Open Science, why do public research funders care, and how can you as an applicant use it to get ahead of the competition? Horizon 2020 now mandates that Open Science is part of the Knowledge Transfer and Communication Strategies of each research project in order to support the Innovation Union's ambitions towards research fueled innovation and growth. The presentation introduces the concept to potential Horizon 2020 applicants. The work is funded by FP7 FOSTER (www.fosteropenscience.eu).