There are different kinds of Commercial Insurances available to small businesses. The most common are liability insurance, property insurance and workers compensation. Depending on the size and kind of your business you may need specialized coverage plans. Some of the common business insurances include:

Property Insurance: This kind of insurance covers loss and damage to real and personal properties. Most of the common coverages are fire damages, flood, injury and others. There are also special cases such as:
Machinery and Boiler insurance- Also known as Mechanical breakdown Insurance or equipment breakdown insurance. This insurance is used for protection against sudden or accidental breakdown of machines and boilers in an industry.
Debris removal- this insurance covers the cost of cleaning the debris after a flood, fire hazard or a windstorm
Builders Risk insurance- covers risks encountered during the construction phase such as a wind or a storm wiping away the flooring
Glass insurance- protection against the broken windows in stores and offices
Marine and Inland- covers goods when they are bring shipped against flood, fire wind etc
Crime- protection against crimes such as robbery, stocks, securities and related stuff
Law insurance- also known as Ordinance insurance. Useful to cover rebuilding costs according to the current building code
Business interruption- when there is a natural calamity that has distracted you from opening your office, Business Interruption insurance is useful to pay you employees, taxes, rents etc

Liability Insurance: This is the kind of insurance that covers damages done to a third party or the direct consumer as a result of using the product. There are different kinds of liability insurances like the

Errors and omissions(E& O)- this kind of insurance covers involuntary mistakes and failures that can cause injury to a third person
Malpractice Insurance- covers professionals like doctors, lawyers and consultants when they have been issued a law suit due to malpractices
Automobile Insurance- Covers automobiles when involved in accidents, theft or other calamities
Officer and Director Liability Insurance- normally used by companies to protect their employers such as Directors and higher officers against a law suit

Workers Compensation Insurance: This type of Insurance covers the employees injuries while on-job. In many states, it is mandatory that the employer with many employees must carry a workers compensation insurance. This covers the companys employees for injuries, legal rights , politics and other unjust practices by the employer.