The document provides an overview of high-performance computing activities in Europe. It discusses key terminology, emerging trends, stakeholders, and ongoing grid and HPC projects. Some of the major projects discussed include PRACE, DEISA, EGEE, and GÉANT2, which provide HPC resources, grid infrastructure, and networking across Europe respectively. The document emphasizes the need for collaboration across the different layers of the HPC ecosystem to effectively support scientific computing and research at European level.