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The European Atomic and Molecular Calculation Centre (CECAM) promotes fundamental research on advanced computational methods and their application to important problems in science and technology. Over the years, CECAM has expanded its focus from atomistic and molecular simulations in physics and chemistry to a wide range of problems in materials science, biology, and medicinal chemistry. CECAM plays a crucial role in fostering the development of computer simulation as a new way of linking theory and experiment, with a growing interest in multiscale modeling and data-driven initiatives like machine learning and artificial intelligence. With 18 nodes established across Europe, Israel, and the US, CECAM organizes scientific workshops, advanced schools, algorithmic and software development events, collaborative research projects, and an international visitors program to advance computational science and stimulate productive collaborations.