HAAD is the Abu Dhabi Health Authority. If you are a health practitioner in Abu Dhabi or planning to settle there and work, you need to get HAAD approval first and foremost.  The Health Authority Abu Dhabi is the health regulation system in the Emirate that implements the whole process of licensing health practitioners in Abu Dhabi who get qualified by meeting the criteria. Apparently, everyone in the field of health needs an approved medical license to pursue their career.