New forms of data, data visualisation and human interaction with data are changing radically and rapidly. As a result, what it means to be ‘data literate’ is also changing. In the big data era, people should no longer be passive recipients of data-based reports. They need to become active data explorers who can plan for, acquire, manage, analyse, and infer from data. The goal is to use data to describe the world and answer puzzling questions with the help of data analysis tools and visualisations. Understanding big data and its powers and limitations is important to active citizenship and to the prosperity of democratic societies. Today’s students therefore need to learn to work and think with data from an early age, so they are prepared for the data- driven society in which they live.