With digital transformation sweeping across sectors and the advent of new electronic identification (eID) technologies, there is a growing trend towards digital identity. In our increasingly digital environment, it is of paramount importance that citizens be in possession of a legal and digital identity if they are to access digital government services and participate fully in the digital economy. In 2018, of the 175 countries with a national ID (foundational or legal identification) system in place, 160 have a system that is at least partially e-ID. However, even in these countries a significant portion of the population still do not have a national ID and over a one billion are still “invisible”, lacking all proof of legal identity. In some countries around the world, significant progress is being made to remedy this, building on established practices and often using the Subscriber Identity Module (SIM) registration, “Know-Your-Customer” (KYC) processes and mobile devices as a foundation. “Digital Identity in the ICT ecosystem: An overview” sets out clearly the different elements in this complex and unfolding landscape. It defines digital identity, provides an overview of the various types of digital identity systems, looks at different approaches taken and the range of challenges being faced, as well as opportunities that arise from using digital identity platforms. These are described in more detail in the next sections.