Digital societies and infrastructure are inextricably linked to each other. Infrastructures of all sorts relate to the digital sphere, ranging from energy and security to transportation and communication networks, platforms, data infrastructures, AI, social media, information systems and knowledge infrastructures. Political systems, markets, media and social life are all interwoven with digital and physical infrastructures. Interdisciplinary research is required to understand how such infrastructures transform societies across the globe. To foster this kind of collaboration, IAS research combines the study of the social, ethical, technical, legal and political aspects of infrastructures and digital systems. Different approaches are combined in IAS research, ranging from fundamental discussions about the foundations of specific methods and the exploration of evolving methodological integration across disciplines to the rethinking of key concepts such as 'data', 'materiality', 'algorithm', 'platform', 'extraction', 'infrastructure', 'AI', 'data ethics', 'mobility' and 'data justice', as well as collaborations with societal stakeholders and industries.