The term 'basis of a lawsuit' can be summarized as a TORT, which is a wrongful act or an infringement of a right leading to civil legal liability. A TORT is a civil wrong that unfairly causes someone else to suffer loss or harm, resulting in legal liability for the person who commits the tortious act. Torts are the basis of many lawsuits and can include intentional torts, such as assault, battery, and false imprisonment, as well as negligence torts, such as medical malpractice and product liability.