California workers' compensation laws provide money and medical benefits to an employee who has an injury as a result of an accident, injury or occupational disease on-the-job. On-the job means within the course and scope of employment.  This means the injury happened when the employee was doing something (work) that benefited the employer.

California workers' compensation is designed to protect workers and their dependents against the hardships from injury or death arising out of the work environment, and in performing job duties. It is intended to benefit the employee and employer alike or equally.  The employee receives money (usually on a weekly or biweekly basis) and medical benefits in exchange for forfeiting the common law right to sue the employer. The employer benefits by receiving immunity from court actions against them by the employee in exchange for accepting liability that is limited and determined. The question of negligence or fault is usually not at issue.