Created in 2005, TERATEC is a non-profit European pole of expertise in High-Performance Computing, numerical simulation and Data Analytics, and brings together more than eighty technological and industrial companies, laboratories and research centres, universities, wishing to combine their resources in the strategic field of HPC and simulation. It forms the core of a Research & Development technology park and is a member of the "SYSTEMATIC Paris Region" industrial cluster. TERATEC is involved in major national and European initiatives to ensure the development and the mastery of HPC/HPDA technologies and to guarantee their dissemination and deployment in the ecosystem.