Didacta, the world's largest education trade fair is organised by Worlddidac, the global association for the education industry, and is a biennial event held in Switzerland. It attracts more than 350 exhibitors, who present their products and teaching aids to over 20,000 visitors. Swisscom has partnered Worlddidac since 2004 and its “Swisscom Arena” offers teachers and students a free platform to exchange views at the trade fair.