With group life plans, every employee is eligible to get coverage, which is usually paid for by the employer.
Whereas, a term life policy is an individual plan you purchase for yourself, and you can keep the coverage, even after you have left your current employer.
Even if you are covered by group life insurance, you may want to purchase your own term policy to make sure you have enough life insurance protection, or don't lose your coverage should you leave your current job.
Learn more about group life versus term life insurance.