Irfu, the Institute for Research into the Fundamental Laws of the Universe, part of CEA’s Fundamental Research Division (DRF), brings together three scientific disciplines – astrophysics, nuclear physics and particle physics – as well as all associated technological expertise. It is positioned to answer the main open questions in the understanding of the four fundamental interactions, on different scales, from the smallest (elementary constituents of matter, nuclear matter) to the largest (energy content and structuring of the Universe). This research calls for the processing of large volumes of data, as well as the mastery of complex simulation tools. Irfu is also involved in the development and operation of the very large Ganil research infrastructure (Grand accélérateur national d’ions lourds) as part of a CEA-CNRS research consortium. The Institute’s technological positioning is geared to the development of the instruments needed to conduct this research (gas pedals, magnets, detectors, electronics, engineering systems). These developments, carried out in close collaboration with industry, extend far beyond the scientific community of physics of the two infinities, as the institute is called upon for its technologies by other scientific communities at the heart of the CEA. The Institute is also committed to leveraging its developments for a wide range of societal applications.