What is PCIe x16 Slot

I got a x570 Aorus Elite coming today and from what i can gather its gonna run at the full pci-e speeds on the primary slot while the

Lightning Fast Game experience: PCIe slots, Lightning Gen 4 x4 ; LAN: Upgraded network solution for professional and multimedia use Delivers a

pcie slot cover PCIe slots have multiple sizes, including PCIe x16 slots, PCIe x8 slots, PCIe x4 slots, and the smallest PCIe x1 slots When getting peripheral

pcie2 slot ECC, SDDC , ADDDC (for x4-based memory DIMMs PCIe x16 full-height half-length slots, plus 1x OCP slot Internal: For