1050ti GPU only lines up with pcie x4 slot - what will happen?

What exactly does the spec “PCIe x16 slot ” mean? pciex4 slot
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slot hoki 33 2 Key M 2280 with PCIe x4 NVMe SSD slot; 1 x Micro SD slot Expansion 1 x MIPI CSI-2 connector ; 1 x Full-size PCI