Whether you own a car or rent, insurance is an important consideration for any driver. Rental companies offer coverage, but it can be pricey and unnecessary if your personal auto policy extends to rentals. If your personal policy doesn't cover rentals, you'll need to purchase rental car insurance to drive legally.
Be sure to note the difference between rental car insurance and rental reimbursement; the latter is an insurance add-on covering rental costs if your car is undergoing repairs.