Meta: course=foundations · module=1 · lesson=1.1 · ~45 min · keywords: digital health, eHealth, mHealth, telehealth, telemedicine, health informatics, HIS, WHO definition, intervention classification, taxonomy Objectives:
- Define digital health and distinguish it from eHealth, mHealth, telehealth, telemedicine, and health informatics.
- Use the WHO Classification of Digital Health Interventions to connect any tool to a user and a health-system challenge.
- Explain why precise terminology produces better strategy and clearer cross-disciplinary communication.
Precision in language matters, because loose terms produce loose strategy. The World Health Organization (WHO) defines digital health as "the field of knowledge and practice associated with the development and use of digital technologies to improve health." It is a deliberately broad umbrella term that contains several older, narrower fields — and knowing which word means what lets a nurse, a data clerk, a pharmacist, and a ministry planner talk about the same thing without confusion.
eHealth is the cost-effective and secure use of information and communications technologies (ICT) in support of health. For two decades this was the dominant term, and many African national strategies are still titled "eHealth strategies." mHealth (mobile health) is the subset of eHealth that uses mobile wireless technologies. In Africa, mHealth carries particular weight: the mobile phone — including the basic feature phone using SMS and USSD text menus — remains the most widely distributed piece of computing infrastructure on the continent, which is why so many landmark programmes run on simple text rather than smartphones. Telehealth is the delivery of health services and information at a distance, while telemedicine is the narrower clinical practice of remote diagnosis, treatment, and consultation by health professionals — for example teleradiology or teledermatology. Health informatics is the science of how health data, information, and knowledge are collected, managed, and used. Finally, a health information system (HIS) is the combination of people, processes, and technologies that collects, manages, and reports health data — from a paper facility register to a national dashboard.
A common error is to treat "digital health" as a thing you buy — an app, a device, a screen. It is better understood as a means of strengthening the health system you already have. It does not replace health workers, medicines, or facilities. It is the multiplier that determines how far those scarce resources reach: extending expertise across distance, automating routine work, and putting timely data into every decision.
To keep this discipline, the WHO Classification of Digital Health Interventions organises tools by the user they serve: interventions for clients (such as targeted health messaging or personal health records), for health workers (decision support, telemedicine, digital training), for health system managers (supply-chain management, staff registries), and for data services (data collection, analytics, interoperability). This classification recurs throughout digital health practice because it forces a question that technology-first conversations skip: every digital investment should trace back to a specific user, a specific health-system challenge, and an expected outcome. A "messaging app" is vague; "provider-to-client messaging to remind caregivers when and where to bring children for vaccination" is a real intervention with a real user and a measurable result.
Two newer ideas complete the modern vocabulary. Digital determinants of health recognise that access to connectivity, devices, literacy, and trustworthy digital services increasingly conditions access to care itself — so digital exclusion becomes a health-equity problem. Health data sovereignty is the principle that nations should govern the health data generated within their borders and capture its value for their own populations — a response to the real pattern of African health data being extracted to train systems owned elsewhere, with little benefit returning home. Both ideas mark the field's maturation: from asking "what can the technology do?" to asking "who controls it, who benefits, and who is left out?"
Key terms:
- Digital health — the field of knowledge and practice of using digital technologies to improve health (WHO); the umbrella term.
- mHealth — health practice supported by mobile devices; in Africa, often SMS/USSD on basic phones.
- Telemedicine — remote clinical services (diagnosis, treatment, consultation) delivered by health professionals.
- Interoperability — the ability of two or more systems to exchange information and to use the information exchanged.
- Digital determinants of health — connectivity, devices, literacy, and trustworthy services that increasingly condition access to care.
Knowledge check:
- Q: What is the difference between telehealth and telemedicine? A: Telehealth is the broad delivery of health services and information at a distance; telemedicine is the narrower clinical practice of remote diagnosis, treatment, and consultation by health professionals.
- Q: Why is the mobile feature phone so important in African digital health? A: Because basic phones using SMS and USSD are the most widely distributed computing infrastructure on the continent, so population-scale services (like maternal messaging) can run on simple text without smartphones.
- Q: What discipline does the WHO Classification of Digital Health Interventions enforce? A: It ties every digital tool to a specific user (client, health worker, manager, or data service), a health-system challenge, and an expected outcome.
- Q: Is digital health a replacement for health workers? A: No — it is a multiplier that extends the reach of scarce workers, medicines, and facilities; it does not substitute for them.
Summary: Digital health is the umbrella field of using digital technologies to improve health, containing eHealth, mHealth, telehealth, telemedicine, health informatics, and HIS. Precise terminology and the WHO intervention classification keep every investment anchored to a user and a real problem, and newer concepts — digital determinants of health and data sovereignty — reframe the field around who benefits and who controls the data.