ok then....
Health insurance is something to defray the astronomical cost of health care in this day and age.
Commonly offered as a benefit of employment, it is managed by a health insurance provider, who deducts a nominal fee from your paychecks (in most cases) and in turn pays the majority of the costs for visits to the doctor and hospital stays/procedures/tests/prescription medications.
Being sick now a days can be a cause of financial ruin and/or death without the help of health insurance.
Providers usually have a tome of rules limitations and such governing what kind of procedures are covered.