EPLI stands for Employment Practices Liability Insurance. This covers discrimination - like for age, sex, race, religion. You cannot discriminate against any employee based on this. It also covers wrongful termination - like getting rid of an employee because they are older.
It also covers sexual harassment, so things like sex jokes, touching, grabbing another employee, leaving notes on another's desk regarding sex. EPLI is something every employer should consider because they don't when a manager or junior level executive does something like this. Because it covers what employees can/will do to another employee becomes your responsibility.