eTwinning is an initiative of the European Commission that allows teachers and students to collaborate on projects online across Europe. It started in 2005 and now includes 33 participating countries. The key aspects of eTwinning are that it provides an online space for collaboration between schools, opportunities for continuing professional development for teachers, tools to recognize work done, and support from national and European services. Teachers can find partners, work on joint projects, and participate in professional development activities all through the eTwinning portal.