Group Term Insurance generally covers an individual for a certain face-amount and period (term). Face amount could be a multiple of an individuals annual income or a fixed amount. This could be offered by employer or employee can have the option to add it at his own expense. Employee can additionally buy the group insurance for his spouse and dependents.
Group Term covers the employee till he is employed with the Group. Some term policies allows you to convert to the permanent products.
Please let us know if you would like to offer this benefit to your employees.