What is the difference between PCIe x4 and PCIE x16?

Related questions

1. Can you put a PCI card in a PCIe x16 slot?
2. Is PCI compatible with PCI Express?
3. Why is PCIe faster than PCI?
4. What's the difference between PCI and PCIe?
5. What is a PCIe x1 slot used for?
6. Is PCIe 3.0 the same as PCIE x16?
7. Can I put a PCIe 4x in a 16x slot?
8. Are there different types of PCI Express slots?
9. Is PCI Express 4 backwards compatible?
10. What is the purpose of a PCI slot?

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4. #consists
5. #physical
6. #confusing
7. #express
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9. #lanes
10. #transmission
11. #connected
12. #cannot