The HO4 insurance policy is most commonly referred to as renters insurance. Whether you rent a home, condo, townhome, or apartment, if you purchased insurance, you most likely have HO-4 insurance (insurance for people who rent).
The HO4 is a named perils policy. There are two categories of insurance policies; named perils and open perils. A named perils policy specifically lists the perils the policy insures. If damage is the result of a peril that is not listed on the policy, the HO4 insurance policy will not insure the damage.