Scuba diving is still evolving, but general classifications have grown up to describe various diving activities. These classifications include but are not limited to:
Commercial diving
Military diving
Combat divers
Armed forces work divers
Recreational diving
Rescue diving
Scientific diving
Technical diving (also called Tech Divers)
Cave diving
Cavern diving
Deep diving
Ice diving
Wreck diving
Within recreational diving there are those who are considered professional divers, because they maintain a professional standard of training and skills (and must, in theory, according to the laws of the area, carry professional liability insurance).
Some consider technical diving to be a subset of recreational diving, but others separate it out due to the extensively different training equipment and knowledge needed for technical dives.
Public safety diving and military diving might likewise be classified as commercial diving because public safety divers and military divers make a living from their pursuit of diving. However, public safety divers (police or rescue) and military divers have a different mission from the typical commercial diver.
Scientific diving is used by marine scientists (including diving marine biologists and underwater archaeologists), as a tool for collecting their research data.
Cradit :wikipedia.org
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