Graduate certificates and graduate citations both recognize your effort in graduate level courses but mark a smaller collection of effort than what is required for a master’s degree.
A graduate certificate is often work done in the 20 to 30 credit hour range while a citation may only require around 15 credit hours. Both certificates and citations give you a way to demonstrate an advanced education.
People who have already obtained a masters degree, may find these options useful to show their skill in specific areas. For example, an MBA might consider getting a graduate certificate or graduate citation in technology to help expand their technical knowledge and use that to help secure a job with broader responsibilities than what they could get with an MBA alone.