It talks about two types / kinds of liability. In short this insurance cover protects the insured from being held for someone else's loss.

Another option is range of liability policies.....
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Types of liability insurance

In many countries, liability insurance is a compulsory form of insurance for those at risk of being sued by third parties for negligence. The most usual classes of mandatory policy cover the drivers of vehicles, those who offer professional services to the public, those who manufacture products that may be harmful, constructors and those who offer employment. The reason for such laws is that the classes of insured are deliberately engaging in activities that put others at risk of injury or loss. Public policy therefore requires that such individuals should carry insurance so that, if their activities do cause loss or damage to another, money will be available to pay compensation. In addition, there are a further range of perils that people insure against and, consequently, the number and range of liability policies has increased in line with the rise of contingency fee litigation offered by lawyers (sometimes on a class action basis). Such policies fall into three main classes:

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Note added at 23 hrs (2011-04-09 05:08:58 GMT)
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Types of liability coverage....
Types of liability insurance...