Each course-section has a maximum number of available seats. Once that maximum has been reached, no additional students may be registered. However, most sections have a waitlist option. If you want to register in a section but it is full, you can choose to add yourself to the waitlist. If/when a seat becomes available, the vacant space will be offered to the first student on the waitlist.
If you add yourself to a waitlist, you are taking responsibility for checking your email at least once per day until you receive a seat offer or until the end of the add/drop period, whichever comes first. Make sure the email address that the College has on file for you is correct! NLC is not responsible for missed or undelivered waitlist offers.