The Extreme Light Infrastructure (ELI) is a research facility with the world’s largest and most advanced collection of high-power lasers. As an international user facility dedicated to multi-disciplinary science and research applications ELI provides access to world-class high-power, high-repetition-rate laser systems and enables cutting-edge research in physical, chemical, materials, and medical sciences, as well as breakthrough technological innovations. ELI operates as a single multi-site organisation with complementary facilities specialised in different fields of research with extreme light, ELI Beamlines located in Dolní Břežany (Czech Republic) and ELI ALPS in Szeged (Hungary).