ING is a globally operating bank of Dutch origin. ING was created in 1991 from a merger between Nationale-Nederlanden and the NMB Postbank Group. With eight million customers, ING is the largest bank in the Netherlands. In addition to a bank account, savings account or investment account, you can also take out a mortgage with ING. Many consumers of this bank have been in a relationship for years by being a customer through legal predecessors such as the Postbank.