Health information technology (health IT) is a term that refers to the electronic systems used by healthcare professionals and patients to store, share, and analyze health information. 
Health IT solutions can include:
Patient information management systems
Electronic health records
Telehealth services
Internet of Medical Things (IoMT)
Health IT solutions can make healthcare delivery more efficient, accurate, and patient-centered. 
Health IT can also refer to the technology and infrastructure used to record, analyze, and share patient data. This can include:
Health record systems
Patient portals
Personal health devices and apps 
Health information systems (HIS) serve multiple users and purposes. These include:
Generating information to help decision-makers identify problems and needs
Making evidence-based decisions on health policy
Allocating scarce resources optimally