The German Climate Computing Center (Deutsches Klimarechenzentrum, DKRZ) is a central service center for German climate and earth system research. Its high performance computers, data storage and services form the central research infrastructure for simulation-based climate science in Germany. Apart from providing computing power, data storage capacity and technical support for models and simulations in climate research, DKRZ offers its scientific users an extensive portfolio of tailor-made services. It maintains and develops application software relevant to climate research and supports its users in matters of data processing. Finally, DKRZ also participates in national and international joint projects and cooperations with the aim of improving the infrastructure for climate modeling.