Usually, it's extra life insurance you can add through your group life insurance plan at work, in increments of your salary, at your cost, not your employer's cost.
Sometimes you can also add your children to your coverage, for a small monthly additional premium, for a couple of thousand dollars in coverage - it's up to your employer if they offer this type of additional life insurance coverage with your plan.
However, you may want to consider buying your own individual term life insurance policy that you can continue, even if you leave your current job.
Employee life insurance plans only provide coverage while you are employed through your current employer. If you leave, get fired, or the company goes out of business, you would lose your coverage, or you may have the option of converting your group term life insurance to a permanent life insurance policy at a much higher premium, usually.
If you buy your own life insurance policy now, you may have coverage guaranteed for up to 30 years. Learn more about how term life insurance works and request your free term life insurance quotes online.