Personal injury is usually defined as an injury that is physical or mental that happens as a result of the actions of an external party. Personal injury is an injury that happens to someone as a result of negligence from the other party or an intent to do harm on purpose. It can also be a result of liability, which essentially means that someone is liable or responsible in some way for the harm. Liability is a legal term that means that an individual is or may be subject to legal obligation. When one or more person is or may be responsible, it is called joint liability. When someone is involved in distributing, producing, or selling products that do not work or have defects and these products injure someone, that is considered ‘strict liability’.