gpu dual slot

Comments to Colorful Introduces White Edition iGame GPU with Integrated Dual M.2 SSD Slots

what is a gpu dual slot? is there also a single slot gpu, if so what are the differences? ... A dual slot would cover the other one and the single slot would not cover it.

HDCP Ready, 2.2. Form Factor & Dimensions. Max GPU Length, 202 mm. Card Dimensions (L x H), 7.96″ x 4.38″. Slot Width Slot Width, Dual Slot. Additional ...