This document provides an overview of CSC Supercomputing Services in Finland. It discusses the evolution of supercomputers from specialized systems to clusters of commodity servers. CSC operates several supercomputing systems for academic users, including Sisu, a Cray XC40 with over 40,000 cores, and Taito, a cluster with over 18,000 cores. CSC has over 4,000 customers and provides high performance computing resources, storage, networking and support services to the research community in Finland.