This introduction, a Tool for members of parliament, explains the main elements of cybersecurity and its governance: cybercrime, cyberwar, cyberterrorism, cyberespionage and hacktivism and the challenges and opportunities in governing them. Each section is complemented with a list of possible questions that members of parliament can raise in relation to the issue. The questions aim to increase government accountability and that of other key cybersecurity stakeholders. They can be included in questions to the government, discussed in public hearings or inspire parliamentary inquires.