A VVS diamond is a very very slightly included diamond, it has small inclusions that are not noticeable unless the diamond is viewed at 10x magnification and typically in the face-up orientation. Sometimes, the inclusions, blemishes or qualities in VVS2 and VVS1 diamonds are not even visible at 10x magnification, though it varies from one diamond to the next.
Many VVS diamonds are considered eye clean diamonds, which means their inclusions are not visible to the unaided eye.