This is a period during which repayment of the principal and interest of your loan is temporarily delayed. During a deferment/forbearance, you do not need to make payments. You are responsible for paying the interest that accrues (accumulates) during the deferment period, but your payment is not due during the deferment period. You can request a deferment or forbearance by contacting your loan servicer.
Your loans are automatically put into deferment if you are a student in a degree granting program and enrolled at least ½ time.
See the federal student aid web site for further details.