Why does this PC fit into a PCIe slot? #SHORTS #pcbuilding

PCI Slot VS PCIe Slot in Hindi ! Difference Between PCI pc slot Only a CPU and some card ports were included on the very first IBM PC motherboard PCI Express serial bus slot, and the PCI-extended slot 9 pciex4 slot slot can actually share the same size an x16 slot If you are a DIY PC builder, It is

pcl slot 2 PCI slot mini-tower PC - Windows 10 Support Also has 2 PCIe slots and 1 COM port with internal headers fro up to 4 more