1. If you are an undergraduate and don't have a degree certificate for various reasons, you still have a diploma, which can also be used as a basis for graduation.

College students don't have a degree certificate, only a diploma.

3. After graduation, if it is not required by the employer, you generally don't need a degree certificate, just look at the diploma. If you need to work in institutions, large state-owned enterprises and other units, the condition for registration is to have a degree certificate. Without a degree certificate, you are not even qualified to apply.