Technically disability insurance is a financial services product designed to replace a portion of your income in the event a sickness or accident prevents you from earning an income in your occupation. What it really does is protect families in the event one of the breadwinners can no longer support the family because of an illness or accident. There are many kinds of disability insurance, and no two disability insurance policies are the same, so make sure you purchase your disability insurance policy from an experienced agent, and from a top tier company with experience in this line of business.