Is PCI Express 4 backwards compatible?

Related questions

1. Can you use PCI Express 3.0 in 2.0 slot?
2. What is the purpose of a PCI slot?
3. Is PCIe 3.0 the same as PCIE x16?
4. What is the difference between PCI and PCIe?
5. What's the difference between PCI Express x1 and x16?
6. Is PCI and PCIe the same?
7. Will PCIe 2 work in PCIE x16?
8. Can you put a PCI card in a PCIe x16 slot?
9. How fast is PCIe 4?
10. Can I install PCIe card in PCI slot?

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