The European Social Forum (ESF) was a recurring conference held by members of the alter-globalization movement (also known as the Global Justice Movement). In the first few years after it started in 2002 the conference was held every year, but later it became biannual due to difficulties with finding host countries. The conference was last held in 2010. It aims to allow social movements, trade unions, NGOs, refugees, peace and anti-imperial groups, anti-racist movements, environmental movements, networks of the excluded and community campaigns from Europe and the world to come together and discuss themes linked to major European and global issues, in order to coordinate campaigns, share ideas and refine organizing strategies. It emerged from the World Social Forum and follows its Charter of Principles.