eTwinning is the largest European online community for schools, allowing teachers and students to collaborate on projects. It has three main levels - the eTwinning portal which is the central meeting place, eTwinning Live which is teachers' personal spaces, and TwinSpace which is used for collaborative projects. Projects involve peer learning, cross-cultural exchange, and developing skills through teamwork and using technologies. Successful projects are integrated with school curricula and evaluated using rubrics, with recognition available through quality labels.