In 2016, Internet usage rates are about twice as high in developed countries as in developing countries, and more than twice as high in developing countries, as a whole, than as in least developed countries. The SDGs, which succeed the Millennium Development Goals that guided international development policy between 2000 and 2015, are summarized in Table 3.1. They are applicable to all countries and regions, and are intended to ensure that 'no one is left behind' in the course of progress towards sustainable development. This chapter outlines each of these indicators, considers the availability of relevant data, and takes stock of current levels of achievement.