1x slots refer to expansion slots on a motherboard that allow you to add various components like graphics cards or network cards. These slots are commonly found on desktop computers and provide flexibility for upgrading your system. It is important to check the number and type of 1x slots available on your motherboard before purchasing additional hardware. Some motherboards may have multiple 1x slots, allowing you to customize your setup further. Overall, 1x slots play a crucial role in enhancing the functionality and performance of your computer.