Why is PCIe faster than PCI?

Related questions

1. Which is faster PCI or PCIe?
2. Will a PCIe x16 work in a PCIE x8?
3. Will PCIe 2 work in PCIE x16?
4. Which is better PCI or PCIe?
5. Is PCIe 3.0 the same as PCIE x16?
6. Are there different types of PCI Express slots?
7. What's the difference between PCI Express x1 and x16?
8. Can you put a PCI card in a PCIe x16 slot?
9. Is PCI Express 4 backwards compatible?
10. Is WiFi card good for gaming?

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